CRUST

noun Etymology: Middle English, from Latin ~a; akin to Old English hrūse earth, Greek kryos icy cold, krystallos ice, crystal Date: 14th century 1. the hardened exterior or surface part of bread, a piece of this or of bread grown dry or hard, the pastry cover of a pie, a hard or brittle external coat or covering: as, a hard surface layer (as of soil or snow), the outer part of a planet, moon, or asteroid composed essentially of crystalline rocks, a deposit built up on the interior surface of a wine bottle during long aging, an en~ing deposit of dried secretions or exudate, gall , nerve , ~ verb ~al adjective ~less adjective