'mealy bug' definitions:

Definition of 'mealy bug'

(from WordNet)
noun
Scalelike plant-eating insect coated with a powdery waxy secretion; destructive especially of fruit trees [syn: mealybug, mealy bug]

Definition of 'mealy bug'

From: GCIDE
  • mealybug \meal"y*bug`\, mealy bug \mealy bug\ (m[=e]l"[y^]*b[u^]g`), n. (Zool.), 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. [1913 Webster + WordNet 1.5]