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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 meal·y·bug, mealy bug 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.
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From: WordNet (r) 2.0

 mealy bug
      n : scale-like plant-eating insect coated with a powdery waxy
          secretion; destructive especially of fruit trees [syn: mealybug]