Akademik

flexor
A muscle the action of which is to flex a joint.
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flex·or 'flek-sər, -.sȯ(ə)r n a muscle serving to bend a body part (as a limb) called also flexor muscle compare EXTENSOR

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n.
any muscle that causes bending of a limb or other part.

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flex·or (flekґsor) [L.][TA] 1. causing flexion. 2. any muscle that flexes a joint; see under musculus.

Medical dictionary. 2011.