-id2 Syllabification: (-id)Definition of -id suffix 1forming nouns such as chrysalid, pyramid. 2 Biology forming names of structural constituents:plastid 3 Botany forming names of plants belonging to a family with a name ending in -idaceae:orchidOrigin:from or suggested by French -ide, via Latin -idis from Greek -is, -id--id in other Oxford dictionaries Definition of -id in the British & World English dictionary