syn·o·nym (s n  -nm )n. 1. A word having the same or nearly the same meaning as another word or other words in a language. 2. A word or an expression that serves as a figurative or symbolic substitute for another. 3. Biology A scientific name of an organism or of a taxonomic group that has been superseded by another name at the same rank. [Middle English sinonyme, from Old French synonyme, from Latin syn  nymum, from Greek sunnumon, from neuter of sunnumos, synonymous; see synonymous.]syn o·nymic, syno·nymi·cal adj.syn o·nymi·ty n. |
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