Entomology definition of Extensor September 7, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Extensor Entomology definition of Extensor: that which extends or straightens out; applied to muscles. Entomology Extensor definitionExtensor Entomology explanationExtensor Entomology meaningReviews & Comments