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extensor (n.)

"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).

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Definitions of extensor from WordNet

extensor (n.)
a skeletal muscle whose contraction extends or stretches a body part;
Synonyms: extensor muscle
From wordnet.princeton.edu