heterogamete

noun Cell Biology.

1. either of a pair of conjugating gametes differing in form, size, structure, or sex.

noun

1. a gamete that differs in size and form from the one with which it unites in fertilizationCompare isogamete

n.

1. Either of two conjugating gametes that differ in structure or behavior, such as the small motile male spermatozoon and the larger nonmotile female ovum.