/ Dictionary / Index I isogamy: Meaning and Definition of Find definitions for: i•sog•a•my Pronunciation: (ī-sog'u-mē), [key] — n. Biol. the fusion of two gametes of similar form, as in certain algae. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: isogamy (Thesaurus) isogamous isogenous Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language