Entomology definition of Protractor September 12, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Protractor Entomology definition of Protractor: that which extends or lengthens out: applied to muscles. Entomology Protractor definitionProtractor Entomology explanationProtractor Entomology meaningReviews & Comments