periodic : Idioms & Phrases

• noun any acid of iodine that contains oxygen
  

WordNet

• noun irregular breathing of newborns; periods of rapid breathing followed by apnea; believed to be associated with sudden infant death syndrome
  

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• noun abnormal respiration in which periods of shallow and deep breathing alternate
  Cheyne-Stokes respiration.
  

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• (Astron.), a comet that moves about the sun in an elliptic orbit; a comet that has been seen at two of its approaches to the sun.

Webster 1913

• noun recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs
  giant hives; Quincke's edema; atrophedema; angioedema.
  

WordNet

• noun an event that recurs at intervals
  recurrent event.
  

WordNet

• (Math.), a function whose values recur at fixed intervals as the variable uniformly increases. The trigonomertic functions, as sin x, tan x, etc., are periodic functions. Exponential functions are also periodic, having an imaginary period, and the elliptic functions have not only a real but an imaginary period, and are hence called doubly periodic.

Webster 1913

• noun (chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers
  Mendeleev's law.
  

WordNet

• (Chem.), the generalization that the properties of the chemical elements are periodic functions of their atomic wieghts. "In other words, if the elements are grouped in the order of their atomic weights, it will be found that nearly the same properties recur periodically throughout the entire series." The following tabular arrangement of the atomic weights shows the regular recurrence of groups (under I., II., III., IV., etc.), each consisting of members of the same natural family. The gaps in the table indicate the probable existence of unknown elements. TABLE OF THE PERIODIC LAW OF THE CHEMICAL ELEMENTS(The vertical columns contain the periodic groups)Series1{ 2{ 3{ 4{ 5{ 6{ 7{ 8{ 9{ 10{ 11{ 12{ |I. II. III. IV. V. VI. VII. VIII. | RH4 RH3 RH3 RH |R2O RO R3O3 RO2 R2O5 RO3 R2O7 RO4 H1Li7Na23K39(Cu)63Rb85.2(Ag)(108)Cs133(-)(-)(Au)(197)(-) - ✍ A similar relation had been enunciated in a crude way by Newlands; but the law in its effective form was developed and elaborated by Mendelejeff, whence it is sometimes called Mendelejeff's law. Important extensions of it were also made by L. Meyer. By this means Mendelejeff predicted with remarkable accuracy the hypothetical elements ekaboron, ekaluminium, and ekasilicon, afterwards discovered and named respectively scandium, gallium, and germanium.

Webster 1913

• noun motion that recurs over and over and the period of time required for each recurrence remains the same
  periodic motion.
  

WordNet

• noun motion that recurs over and over and the period of time required for each recurrence remains the same
  periodic motion.
  

WordNet

• noun a complex sentence in which the main clause comes last and is preceded by the subordinate clause
  

WordNet

• (Astron.), a variable star whose changes of brightness recur at fixed periods.

Webster 1913

• noun (chemistry) a tabular arrangement of the chemical elements according to atomic number as based on the periodic law
  

WordNet

• (Astron.), the time of a complete revolution of the body about the sun, or of a satellite about its primary.

Webster 1913