abductor pollicis brevis

noun
abductor pol·​li·​cis brev·​is | \-ˌpäl-ə-səs-ˈbrev-əs, -ə-kəs- \

Medical Definition of abductor pollicis brevis 

: a thin flat muscle of the hand that abducts the thumb at right angles to the plane of the palm

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