Entomology definition of Costate September 7, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Costate Entomology definition of Costate: ribbed; marked with elevated thickened lines. Costate Entomology explanationCostate Entomology meaningEntomology Costate definitionReviews & Comments