Entomology definition of Trigonate September 14, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Trigonate Entomology definition of Trigonate: three-cornered; approximately triangular. Entomology Trigonate definitionTrigonate Entomology explanationTrigonate Entomology meaningReviews & Comments