Source : Webster's Revised Unabridged Dictionary (1913)

Mealy \Meal"y\, a. [Compar. {Mealier}; superl. {Mealiest}.]
   1. Having the qualities of meal; resembling meal; soft, dry,
      and friable; easily reduced to a condition resembling
      meal; as, a mealy potato.

   2. Overspread with something that resembles meal; as, the
      mealy wings of an insect. --Shak.

   {Mealy bug} (Zo["o]l.), a scale insect ({Coccus adonidum},
      and related species), covered with a white powderlike
      substance. It is a common pest in hothouses.