crust (v.) Look up crust at Dictionary.com
late 14c.; see crust (n.). Related: Crusted; crusting.
crust (n.) Look up crust at Dictionary.com
early 14c., "hard outer part of bread," from Old French crouste (13c., Modern French croûte) and directly from Latin crusta "rind, crust, shell, bark," from PIE *krus-to- "that which has been hardened," suffixed form of root *kreus- "to begin to freeze, form a crust." Meaning "outer shell of the earth" is from 1550s.