Entomology definition of Deltoid September 7, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Deltoid Entomology definition of Deltoid: elongate triangular: resembling a Greek D with apex extended. Deltoid Entomology explanationDeltoid Entomology meaningEntomology Deltoid definitionReviews & Comments