Definition of extensor noun from the Oxford Advanced Learner's Dictionary

 

extensor

 noun
noun
BrE BrE//ɪkˈstensə(r)//
 
, also BrE//ekˈstensə(r)//
 
; NAmE NAmE//ɪkˈstensɔːr//
 
(also extensor muscle)(anatomy)
 
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a muscle that allows you to make part of your body straight or stretched out compare flexor Word Origin early 18th cent.: from late Latin, from extens- ‘stretched out’, from the verb extendere ‘stretch out’, from ex- ‘out’ + tendere ‘stretch’.
See the Oxford Advanced American Dictionary entry: extensor