'anisomyarian' originates from Greek elements: 'anisos' meaning 'unequal' and 'mys/myo' meaning 'muscle', combined with the adjectival/agent suffix '-arian' (from Latin/English formation).

'anisomyarian' was formed in modern biological/zoological terminology by combining the Greek prefix 'aniso-' + Greek root 'myo-' with the English/Latin-derived suffix '-arian'; it entered technical usage in comparative morphology and malacology in the 19th–20th century.

Initially it denoted simply 'unequal-muscled' in literal morphological description; that specific anatomical meaning has been preserved and remains the primary usage in modern biology.