/ Dictionary / Index G glochidium: Meaning and Definition of Find definitions for: glo•chid•i•um Pronunciation: (glō-kid'ē-um), [key] — pl. -chid•i•a glochid. the larva of a freshwater mussel of the family Unionidae that lives as a temporary parasite in the gills or on other external parts of fishes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: glochidium (Thesaurus) glochid glockenspiel Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language