Entomology definition of Cecidium September 7, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Cecidium Entomology definition of Cecidium: a gall. Cecidium Entomology explanationCecidium Entomology meaningEntomology Cecidium definitionReviews & Comments