'anisosthenic' originates from modern scientific coinage using Greek elements: 'aniso-' (Greek 'anisos') meaning 'unequal' and 'sthenos' meaning 'strength', combined with the adjectival suffix '-ic'.

'anisosthenic' was formed in modern scientific English (via New Latin-style formation) from the Greek elements 'aniso-' + 'sthenic' (from 'sthenos') rather than evolving directly from an older English word; it is a technical formation used in specialized fields.

Initially it meant 'having unequal strength' (based directly on its Greek elements), and this core meaning has been preserved in its technical usage.