a gamete that differs in size and form from the one with which it unites in fertilization
Compare isogamete
heterogamete in American English
(ˌhɛtərˌoʊˈgæmˌit; ˌhɛtərˌoʊgəˈmit)
noun
a gamete differentiated in size, structure, or activity from another with which it unites, typified by the relatively large ovum and the much smaller and more active sperm