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The Collaborative International Dictionary
Extensor

Extensor \Ex*ten"sor\, n. [L., one who stretches. See Extend.] (Anat.) A muscle which serves to extend or straighten any part of the body, as an arm or a finger; -- opposed to flexor.

Douglas Harper's Etymology Dictionary
extensor

"muscle which serves to straighten or extend any part of the body," 1713, short for medical Latin musculus extensor, from Late Latin extensor "stretcher," agent noun from Latin extendere "spread out, spread" (see extend).

Wiktionary
extensor

n. (context anatomy English) A muscle whose contraction extends or straightens a limb or body part.

WordNet
extensor

n. a skeletal muscle whose contraction extends or stretches a body part [syn: extensor muscle] [ant: flexor muscle]

Usage examples of "extensor".

This is the virile aesthetic and ethic of the extensor muscles -- the bold, buoyant, assertive beliefs and preferences of proud, dominant, unbroken and unterrified conquerors, hunters, and warriors -- and it has small use for the shams and whimperings of the brotherly, affection-slobbering peacemaker and cringer and sentimentalist.

She informed me that she had practised archery as a hobby, and the effects of the sport were visible in a somewhat enlarged brachialis of the right arm and a firmness of the extensor and flexor muscles.

The command suits did not have extensors so the commanders and staff were firing their rifles by holding them up out of their holes.

Already the data-gathering extensors of the media were busily at work, collecting, recording, transmitting all.

She took a pair of needle-like extensors from a small flat case and clicked them on to the offered tentacles.

It is a smooth muscle like the extensor muscles of the back, not a striated muscle like the biceps.

This is the virile aesthetic and ethic of the extensor muscles -- the bold, buoyant, assertive beliefs and preferences of proud, dominant, unbroken and unterrified conquerors, hunters, and warriors -- and it has small use for the shams and whimperings of the brotherly, affection slobbering peacemaker and cringer and sentimentalist.

Byrne retracted the extensor, bringing the boards up against the pod, plugging them into the external test and repair unit.

Byrne retracted the extensor, bringing the boards up against the pod, plugging them into the exter­.

The section was neat, clearly revealing the tendon of the extensor muscle.

It has an extremely wide flank-membrane, stretching from the corners of the jaw to the tail, and including the limbs and the elongated fingers: the flank membrane is, also, furnished with an extensor muscle.

As the cruiser rushed toward us, Infante swept his extensor beam out across the road and the driver barely had time to duck before a set of wailing gangsaws took away his windshield and roof.

It kept talking about extensors and flexors, the gastrocnemius muscle, and so on.

Moving very carefully, Gonzales took hold of the claw-like extensors, swung his legs out of bed, and stepped onto the sam's back, then to the floor.

I keyed all extensor subsystems for access only by primary operators, so I wouldn’t worry about Scortia accidentally shoving his remoting axle through a brick wall while I was in Ashland.