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.

Source: Webster's Revised Unabridged Dictionary (1913)