Pronunciation: (sin'u-nim), [key]
1. a word having the same or nearly the same meaning as another in the language, as joyful, elated, glad.
2. a word or expression accepted as another name for something, as Arcadia for pastoral simplicity; metonym.
3. Biol.one of two or more scientific names applied to a single taxon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.