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A concave surface, or the space bounded by it; the state of being concave.

An upward concavity in the under side of a beam, girder, or lintel; also, a slight upward concavity in a straight arch. See Hogback. Camber arch (Arch.), an arch whose intrados, though apparently straight, has a slightly concave curve upward. -- Camber beam (Arch.), a beam whose under side has a concave curve upward.…

Hollowness; concavity.

The external ear; esp. the largest and deepest concavity of the external ear, surrounding the entrance to the auditory canal.

The state of being concave, or like a dish, or the degree of such concavity; as, the dish of a wheel.

A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel. Forests grew Upon the barren hollows. Prior. I hate the dreadful hollow behind the little wood. Tennyson.

Obovate, with a concavity in each side, like the body of a violin; fiddle-shaped; as, a panduriform leaf; panduriform color markings of an animal.