'oogonial' originates from New Latin/Modern Latin, specifically the word 'oogonium', where the combining form 'oo-' (from Greek 'ōon' / 'oon') meant 'egg' and 'gon-' (from Greek 'gōnós' / 'gonos') meant 'seed' or 'offspring', with the adjectival suffix '-al'.

'oogonial' changed from the New Latin noun 'oogonium' (used in biological terminology for the egg-producing cell/structure) and eventually formed the English adjective 'oogonial' by adding the suffix '-al'.

Initially, it designated something 'of or relating to an oogonium (egg-producing cell)', and over time it has remained a specialized adjective with that same biological sense.