extensor

noun (n)

1. a skeletal muscle whose contraction extends or stretches a body part (noun.body)

   Sinonim: extensor muscle

   Antonim: flexor, flexor muscle

   Sumber: wordnet30

2. A muscle which serves to extend or straighten any part of the body, as an arm or a finger; -- opposed to flexor. (noun)

   Sumber: webster1913