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reaction Idioms & Phrases


addition reaction

  • noun a chemical reaction in which one molecule is added to another
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aldol reaction

  • noun a reaction of aldehydes resulting in an aldol
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Alkaline reaction

  • a reaction indicating alkalinity, as by the action on limits, turmeric, etc.
Webster 1913

allergic reaction

  • noun hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
    allergy.
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anamnestic reaction

  • noun renewed rapid production of an antibody on the second (or subsequent) encounter with the same antigen
    anamnestic response.
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anxiety reaction

  • noun an anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension or sweating or trembling or lightheadedness or irritability etc that has lasted for more than six months
    generalized anxiety disorder; GAD.
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Blowpipe reaction

  • (Chem.), the characteristic behavior of a substance subjected to a test by means of the blowpipe.
Webster 1913

catholic reaction force

  • noun a radical terrorist group dedicated to the removal of British forces from Northern Ireland and the unification of Ireland
    Irish National Liberation Army; People's Liberation Army; INLA; People's Republican Army.
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chain reaction

  • noun a series of chemical reactions in which the product of one is a reactant in the next
  • noun a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others
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chemical decomposition reaction

  • noun (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
    chemical decomposition reaction; decomposition.
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chemical reaction

  • noun (chemistry) a process in which one or more substances are changed into others
    reaction.
    • there was a chemical reaction of the lime with the ground water
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conditional reaction

  • noun an acquired response that is under the control of (conditional on the occurrence of) a stimulus
    acquired reflex; conditional response; conditional reaction; conditioned reflex; conditioned response; conditional reflex.
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conditioned reaction

  • noun an acquired response that is under the control of (conditional on the occurrence of) a stimulus
    acquired reflex; conditional response; conditional reaction; conditioned reflex; conditioned response; conditional reflex.
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conversion reaction

  • noun a mental disorder characterized by the conversion of mental conflict into somatic forms (into paralysis or anesthesia having no apparent cause)
    conversion disorder; conversion hysteria.
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decomposition reaction

  • noun (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
    chemical decomposition reaction; decomposition.
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defence reaction

  • noun (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
    defence; defence mechanism; defense; defense mechanism; defence reaction.
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defense reaction

  • noun (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
    defence; defence mechanism; defense; defense mechanism; defence reaction.
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Diazo reactions

  • (Chem.), a series of reactions whereby diazo compounds are employed in substitution. These reactions are of great importance in organic chemistry.
Webster 1913

displacement reaction

  • noun (chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound
    displacement.
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double decomposition reaction

  • noun a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)
    double decomposition; metathesis.
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double replacement reaction

  • noun a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
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elimination reaction

  • noun a chemical reaction in which a molecule decomposes to two different molecules
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endoergic reaction

  • noun a nuclear reaction occurring with absorption of energy
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endothermic reaction

  • noun a chemical reaction accompanied by the absorption of heat
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exoergic reaction

  • noun a nuclear reaction accompanied by the evolution of energy
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exothermic reaction

  • noun a chemical reaction accompanied by the evolution of heat
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Flame reaction

  • (Chem.), a method of testing for the presence of certain elements by the characteristic color imparted to a flame; as, sodium colors a flame yellow, potassium violet, lithium crimson, boracic acid green, etc. Cf. Spectrum analysis, under Spectrum.
Webster 1913

hypersensitivity reaction

  • noun an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock
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immune reaction

  • noun a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen
    immune response; immunologic response.
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insulin reaction

  • noun hypoglycemia produced by excessive insulin in the system causing coma
    insulin shock.
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law of action and reaction

  • noun action and reaction are equal and opposite
    third law of motion; Newton's third law of motion; Newton's third law.
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learned reaction

  • noun a reaction that has been acquired by learning
    learned response.
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light reaction

  • noun the first stage of photosynthesis during which energy from light is used for the production of ATP
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molisch reaction

  • noun biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha-naphthol in the presence of sulfuric acid
    Molisch's test; alpha-naphthol test; Molisch test.
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neutralisation reaction

  • noun a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water
    neutralization; neutralisation; neutralisation reaction.
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neutralization reaction

  • noun a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water
    neutralization; neutralisation; neutralisation reaction.
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nuclear fusion reaction

  • noun a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
    fusion; nuclear fusion.
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nuclear reaction

  • noun (physics) a process that alters the energy or structure or composition of atomic nuclei
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photochemical reaction

  • noun a chemical reaction produced by the action of light
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physiological reaction

  • noun an automatic instinctive unlearned reaction to a stimulus
    inborn reflex; innate reflex; reflex action; instinctive reflex; reflex response; unconditioned reflex; reflex.
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quellung reaction

  • noun the swelling of the capsule surrounding a microorganism after reaction with an antibody; the basis of certain tests for identifying microorganisms
    quellung.
    • pneumococcus quellung
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reaction engine

  • noun a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream
    reaction engine.
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reaction formation

  • noun (psychiatry) a defense mechanism in which a person unconsciously develops attitudes and behavior that are the opposite of unacceptable repressed desires and impulses and serve to conceal them
    • his strict morality is just a reaction formation to hide his sexual drive
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reaction propulsion

  • noun propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum
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Reaction time

  • noun the time that elapses between a stimulus and the response to it
    latency; latent period; response time.
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  • (Physiol.), in nerve physiology, the interval between the application of a stimulus to an end organ of sense and the reaction or resulting movement; called also physiological time.
Webster 1913

reaction turbine

  • noun a turbine with blades arranged to develop torque from gradual decrease of steam pressure from inlet to exhaust
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Reaction wheel

  • (Mech.), a water wheel driven by the reaction of water, usually one in which the water, entering it centrally, escapes at its periphery in a direction opposed to that of its motion by orifices at right angles, or inclined, to its radii.
Webster 1913

reaction-propulsion engine

  • noun a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream
    reaction engine.
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startle reaction

  • noun a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions
    startle response.
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thermonuclear reaction

  • noun a nuclear fusion reaction taking place at very high temperatures (as in the sun)
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transfusion reaction

  • noun reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death
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type i allergic reaction

  • noun an allergic reaction that becomes apparent in a sensitized person only minutes after contact
    immediate allergy; atopic allergy; atopy.
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type iv allergic reaction

  • noun an allergic reaction that becomes apparent only hours after contact
    delayed allergy.
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wasserman reaction

  • noun a blood test to detect syphilis; a complement fixation test is used to detect antibodies to the syphilis organism treponema; a positive reaction indicates the presence of antibodies and therefore syphilis infection
    Wassermann; Wassermann test.
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"Rowling never met an adverb she didn't like."

-Stephen King on J.K Rowling's excessive use of adverbs.

Fear not the Adverb Hell!

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