polyatomic From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences Definitionsadjective(of a molecule or ion) Consisting of three or more atoms. Related wordsSynonymsmultimolecularmultiatommultivalentpolyvalentmulticationicpolyfunctionaltricappedpolymerousmultielectronicmultichemicalternarytriheteromerictriplepolyadicpolydentatetrimetal References Wiktionary — polyatomic Wikipedia — polyatomic