Defn: The shell of crabs, lobsters, etc.

5. (Med.)

Defn: A hard mass, made up of dried secretions blood, or pus, occurring upon the surface of the body.

6. An incrustation on the interior of wine bottles, the result of the ripening of the wine; a deposit of tartar, etc. See Beeswing.

CRUST
Crust, v. t. [imp. & p.p. Crusted; p. pr. & vb. n. Crusting.] Etym:
[Cf. OF. crouster, L. crustare. See Crust, n. ]

Defn: To cover with a crust; to cover or line with an incrustation;
to incrust.
The whole body is crusted over with ice. Boyle.
And now their legs, and breast, and bodies stood Crusted with bark.
Addison.
Very foul and crusted bottles. Swift.
Their minds are crusted over, like diamonds in the rock. Felton.

CRUST
Crust, v. i.

Defn: To gather or contract into a hard crust; to become incrusted.
The place that was burnt . . . crusted and healed. Temple.

CRUSTA
Crus"ta (krs"t), n. Etym: [L., shell, crust, inlaid work.]

1. A crust or shell.