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English definition of “extensor”

extensor

noun [C]     /ɪkˈstent.sər/ US  /ɪkˈsten.sər/ specialized
a muscle that moves an arm , leg or other body part into a straight position from a bent oneSubstances and structures in the body
(Definition of extensor noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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