This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A muscle that when contracted acts to bend a joint or limb in the body.

n. A muscle whose contraction acts to bend a joint or limb.

n. A muscle which bends or flexes any part; ; -- opposed to extensor.

n. In anatomy, a muscle whose function is to bend or produce flexion: opposed to extensor. See flection, 5. Also, improperly, flector.

n. A short muscle of the palm of the hand, bending the little finger.

n. A short muscle of the palm of the hand, bending the thumb. See cut under muscle.

n. A deep-seated muscle of the back of the leg, flexing the great toe.

n. a skeletal muscle whose contraction bends a joint

"Houston's Daryle Ward says his hip flexor is improved, so if you haven't cut him yet, go ahead and play him."

extensor   

striated muscle    skeletal muscle   

opponens pollicis    flexor hallucis longus    flexor carpi radialis    flexor carpi ulnaris    flexor metatarsi    flexor longus digitorum    flexor tarsi anterior    perforatus    profundus    flexor accessorius   

extensor    gastrocnemius    tendon    quadriceps    fasciae    corded    brachii    dorsalis    sphincter    ligament