opponens hallucis
/əˌpəʊnənz ˈhaluːsɪs/Anatomy and Zoology
noun
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.
Origin
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.