monatomic Meaning, Definition & Usage

  1. adjective of or relating to an element consisting of a single atom
    monoatomic.
    • helium and argon are monatomic gases

WordNet

Mon`a*tom"ic adverb
Etymology
Mon- + atomic.
Definitions
  1. (Chem.) (a) Consisting of, or containing, one atom; as, the molecule of mercury is monatomic. (b) Having the equivalence or replacing power of an atom of hydrogen; univalent; as, the methyl radical is monatomic.

Webster 1913