'isogamic' originates from Greek, specifically the elements 'isos' and 'gamos', where 'isos' meant 'equal' and 'gamos' meant 'marriage' or 'union'.

'isogamic' entered scientific usage via New Latin/Neo‑Latin forms (e.g. 'isogamicus') based on Greek roots and was adopted into English in the 19th century to describe equal-sized gametes and related phenomena.

Initially derived from components meaning 'equal' + 'marriage/union', it came to be used specifically in biology to mean 'relating to gametes of equal size' and has remained a technical biological term.