noun Anatomy.
a muscle that serves to flex or bend a part of the body.

1605–15; < Neo-Latin; see flex1, -tor

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World English Dictionary
flexor (ˈflɛksə)
Compare extensor any muscle whose contraction serves to bend a joint or limb
[C17: New Latin; see flex]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1610s, Mod.L., agent noun from flectere "to bend."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

flexor flex·or (flěk'sər)
A muscle that when contracted acts to bend a joint or limb in the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
flexor   (flěk'sər)  Pronunciation Key 
A muscle that bends or flexes a joint. Compare extensor.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for Flexor
The digital flexor flexes the toe and knee and extends the elbow.
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