say it: mah-nuh-TAH-mik
monatomic is an adjective meaning "of or relating to an element consisting of a single atom". It carries one recorded sense.
of or relating to an element consisting of a single atom
“helium and argon are monatomic gases”
Definitions, synonyms and semantic relations for monatomic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.