'anisogonal' originates from Greek elements: 'anisos' (Greek) meaning 'unequal' and 'gōnia' (Greek) meaning 'angle', combined into the adjective-forming element '-gonal'.

'anisogonal' is a modern English scientific coinage formed from Greek roots (via New Latin/technical usage). The components 'anisos' + 'gōnia' were combined in technical vocabulary to produce terms like 'isogonal' and then 'anisogonal' for the negated sense.

Initially coined to denote 'unequal-angled' in technical descriptions, the meaning has remained essentially the same and is still used to describe figures or crystals with unequal angles.