(1):
(n.) A sweetish exudation in the form of pale yellow friable flakes, coming from several trees and shrubs and used in medicine as a gentle laxative, as the secretion of Fraxinus Ornus, and F. rotundifolia, the manna ashes of Southern Europe.
(2):
(n.) A name given to lichens of the genus Lecanora, sometimes blown into heaps in the deserts of Arabia and Africa, and gathered and used as food.
(3):
(n.) The food supplied to the Israelites in their journey through the wilderness of Arabia; hence, divinely supplied food.