Entomology definition of Extrorse -um September 7, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Extrorse -um Entomology definition of Extrorse -um: toward the outside. Entomology Extrorse -um definitionExtrorse -um Entomology explanationExtrorse -um Entomology meaningReviews & Comments