Entomology definition of Horizontal September 9, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Horizontal Entomology definition of Horizontal: said of wings when held parallel to the horizon. Entomology Horizontal definitionHorizontal Entomology explanationHorizontal Entomology meaningReviews & Comments