anisogamyPronunciation: /ˌanʌɪˈsɒgəmi/Definition of anisogamy noun [mass noun] Biology sexual reproduction by the fusion of dissimilar gametes. Compare with isogamy.Derivatives anisogamousPronunciation: /anʌɪˈsɒgəməs/ adjective Origin: late 19th century: from Greek anisos 'unequal' + -gamy (from gamos 'marriage')anisogamy in other Oxford dictionaries Definition of anisogamy in the US English dictionary