'anisogamic' originates from Greek via New Latin, specifically from the combining form 'aniso-' (Greek 'anisos') meaning 'unequal' and the element 'gam-'/'gamy' from Greek 'gamos' meaning 'marriage' or 'union', plus the English adjectival suffix '-ic'.

'anisogamic' derives from New Latin/modern scientific formations such as 'anisogamia'/'anisogamy' (coined in biological contexts in the 19th century) and later took the English adjectival ending to form 'anisogamic'.

Initially formed from elements meaning 'unequal marriage/union', the term's meaning specialized in biology to refer specifically to 'inequality in gamete size or form' and things relating to that condition.