Entomology definition of Grès September 9, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Grès Entomology definition of Grès: the gummy layer surrounding the silk thread spun by a caterpillar. Entomology Grès definitionGrès Entomology explanationGrès Entomology meaningReviews & Comments