oogamy /oʊˈɒɡəmi/ noun1 •A form of anisogamy (heterogamy) in which the female gamete (e.g. ovum) is significantly larger than the male gamete (sperm) and is non-motile.In the majority. motile zoospores or gametes are formed; sexual processes have evolved independently in various divisions and have included the development of oogamy. — 1987
