n.
A muscle that extends or straightens a limb or body part.
[New Latin extēnsor, from Latin extēnsus, past participle of extendere, to stretch out. See extend.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
