monatomic

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌmɒnəˈtɒmɪk/US:USA pronunciation: respellingUSA pronunciation: respelling(mon′ə tom′ik)


WordReference Random House Unabridged Dictionary of American English © 2026
mon•a•tom•ic  (mon′ə tom′ik),USA pronunciation adj. [Chem.]
  1. Chemistryhaving one atom in the molecule.
  2. Chemistrycontaining one replaceable atom or group.
  3. Chemistryhaving a valence of one.
Also, monoatomic. 
  • mon- + atomic 1840–50
mon′a•tom′i•cal•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::
monatomic /ˌmɒnəˈtɒmɪk/, monoatomic /ˌmɒnəʊəˈtɒmɪk/ adj
  1. (of an element) having or consisting of single atoms
  2. (of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction
  3. a less common word for monovalent
'monatomic' also found in these entries (note: many are not synonyms or translations):
monoatomic - argon - krypton - xenon

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