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An adherent crust; an incrustation. Pepys.

The removal of a crust.

The act of incrusting, or the state of being incrusted.

ocess of photography. Abney. -- Gas carbon, a compact variety of carbon obtained as an incrustation on the interior of gas retorts, and used for the manufacture of the carbon rods of pencils for the voltaic, arc, and for the plates of voltaic batteries, etc.

ard external coat or covering of anything; the hard exterior surface or outer shell; an incrustation; as, a crust of snow. I have known the statute of an emperor quite hid under a crust of dross. Addison. Below this icy crust of conformity, the waters of infidelity lay dark and deep as ever. Prescott.…

That which is formed as a crust; incrustment; incrustation. Disengaging truth from its encrustment of error. I. Taylor.

e cadmium sulphide, a mineral occurring in yellow hexagonal crystals, also as an earthy incrustation.

Incrustation. [R.]

he character of a cell wall, by which it becomes harder. It is supposed to be due to an incrustation of lignin.

A sulphide of nickel, commonly occurring in delicate capillary crystals, also in incrustations of a bronze yellow; -- sometimes called hair pyrites.

re me. Jer. ii. 22. Cubic niter, a deliquescent salt, sodium nitrate, found as a native incrustation, like niter, in Peru and Chili, whence it is known also as Chili saltpeter. -- Niter bush (Bot.), a genus (Nitraria) of thorny shrubs bearing edible berries, and growing in the saline plains of Asia and Northern Africa…

A cellular calc tufa, which in some places forms incrustations on the stems of plants, -- formerly supposed to have the quality of uniting fractured bones.

The color or incrustation which age gives to works of art; especially, the green rust which covers ancient bronzes, coins, and medals. Fairholt.

That which is petrified; popularly, a body incrusted with stony matter; an incrustation.

Native boric acid, found in saline incrustations on the borders of hot springs near Sasso, in the territory of Florence.

An incrustation over a sore, wound, vesicle, or pustule, formed by the drying up of the discharge from the diseased part.

An incrustation deposit on the inside of a vessel in which water is heated, as a steam boiler.

or greenish black mineral occurring in foliated flates, also in velvety bronze-colored incrustations. It is a hydrous silicate of iron and alumina.

f manna. Tamarisk salt tree, an East Indian tree (Tamarix orientalis) which produces an incrustation of salt.

A yellow, earthy incrustation, consisting essentially of the oxide of uranium, but more or less impure.