The Collaborative International Dictionary
Coccus adonidum
mealybug \meal"y*bug`\, mealy bug \mealy bug\ (m[=e]l"[y^]*b[u^]g`), n. (Zo["o]l.), Any of several homopteran scale insects (as, Coccus adonidum, and related species of the families Pseudococcidae and Eriococcidae), that cover themselves with a white powderlike or cottony wax secretion. They are common plant-eating pests in hothouses and are also destructive of fruit trees.