One of the mysteries of the English language finally explained.
A muscle of the foot corresponding to the opponens pollicis of the hand, best developed in certain apes and monkeys and seldom distinguished as a separate muscle in humans.
Late 19th century; earliest use found in Science. From scientific Latin opponens hallucis from classical Latin oppōnēns + scientific Latin hallucis, genitive singular of hallux great toe.
opponens hallucis/əˌpəʊnənz ˈhaluːsɪs/
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