Entomology definition of Tri-regional September 14, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Tri-regional Entomology definition of Tri-regional: divided into three distinct parts or regions. Entomology Tri-regional definitionTri-regional Entomology explanationTri-regional Entomology meaningReviews & Comments