Definitions for "Monatomic"
Keywords:  univalent, atom, argon, diatomic, gases
Consisting of, or containing, one atom; as, the molecule of mercury is monatomic.
Having the equivalence or replacing power of an atom of hydrogen; univalent; as, the methyl radical is monatomic.
of or relating to an element consisting of a single atom; "helium and argon are monatomic gases"