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flexor vs. extensor

flexor
[flek-ser] / ˈflɛk sər /

noun

Anatomy.

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

extensor
[ik-sten-ser, -sawr] / ɪkˈstɛn sər, -sɔr /

noun

Anatomy.

  1. a muscle that serves to extend or straighten a part of the body.