Mantle n. : A loose garment to be worn over other garments; an enveloping robe; a cloak. Hence, figuratively, a covering or concealing envelope.

Mantle n. : Same as Mantling.

Mantle n. : The external fold, or folds, of the soft, exterior membrane of the body of a mollusk. It usually forms a cavity inclosing the gills. See Illusts. of Buccinum, and Byssus.

Mantle n. : Any free, outer membrane.

Mantle n. : The back of a bird together with the folded wings.

Mantle n. : A mantel. See Mantel.

Mantle n. : The outer wall and casing of a blast furnace, above the hearth.

Mantle n. : A penstock for a water wheel.

Mantle v. t. : To cover or envelop, as with a mantle; to cloak; to hide; to disguise.

Mantle v. i. : To unfold and spread out the wings, like a mantle; -- said of hawks. Also used figuratively.

Mantle v. i. : To spread out; -- said of wings.

Mantle v. i. : To spread over the surface as a covering; to overspread; as, the scum mantled on the pool.

Mantle v. i. : To gather, assume, or take on, a covering, as froth, scum, etc.

Example:
What causes the direction of currents in the Mantle in the Earth?

Taxonomy
mantle, upper mantle, crust, Earth's mantle, layers, Earth's, composition, 12-25, lower mantle, mantle rocks, pressure, lithosphere, Exploration, 12-26, earthquakes, outer core, free encyclopedia, earth.

Defination from the web:
mantle is a highly viscous layer between the crust and the outer core. ... The uppermost mantle plus overlying crust are relatively rigid and form the lithosphere, an irregular layer with a maximum thickness of perhaps ...