One of the mysteries of the English language finally explained.
A muscle of the hand, originating from the hamate bone and flexor retinaculum and inserting into the fifth metacarpal bone, which draws forward and rotates the fifth metacarpal, cupping the palm and assisting in the opposing of the thumb and other fingers.
Mid 19th century; earliest use found in Todd's Cyclopaedia of Anatomy and Physiology. From scientific Latin opponens digiti minimi from classical Latin oppōnēns + digitī, genitive singular of digitus finger + minimī, masculine genitive singular of minimus smallest.
opponens digiti minimi/əˌpəʊnənz ˌdɪdʒɪtʌɪ ˈmɪnɪmʌɪ//əˌpəʊnənz ˌdɪdʒɪti ˈmɪnɪmi/
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