Entomology definition of Auxiliary vein September 7, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Auxiliary vein Entomology definition of Auxiliary vein: in Diptera (Will.), = subcosta (Comst.). Auxiliary vein Entomology explanationAuxiliary vein Entomology meaningEntomology Auxiliary vein definitionReviews & Comments