crust

CRUST, noun [Latin , G.] 1. An external coat or covering of a thing, which is hard or harder than the internal substance; as the crust of bread; the crust of snow; the crust of dross; the crust of a pie. 2. A piece of crust; a waste piece of bread. 3. A shell, as the hard covering of a crab and some other animals. 4. A scab. 5. The superficial substances of the earth are, in geology, called its crust CRUST, verb transitive 1. To cover with a hard case or coat; to spread over the surface a substance harder than the matter covered; to incrust; as, to crust a thing with clay; to crust cake with sugar; crusted with bark. 2. To cover with concretions. CRUST, verb intransitive To gather or contract into a hard covering; to concrete or freeze, as superficial matter.