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The vertex or top of an arch; -- applied generally to about one third of the curve, but in a pointed arch to the apex only.

To raise to the third power; to obtain the cube of.

A curve of the third degree. Circular cubic. See under Circular.

duct again by the same number. See Cube. -- Cubical parabola (Geom.), two curves of the third degree, one plane, and one on space of three dimensions.

One of the three tarsal bones supporting the first, second third metatarsals. They are usually designated as external, middle, and internal, or ectocuniform, mesocuniform, and entocuniform, respectively.

One of the thirty parts into which the Roman people were divided by Romulus.

or guarding; care, watch, inspection, for keeping, preservation, or security. A fleet of thirty ships for the custody of the narrow seas. Bacon.

the navy. See Curtal ax. Cutlass fish, (Zoöl.), a peculiar, long, thin, marine fish (Trichirus lepturus) of the southern United States and West Indies; -- called also saber fish, silver eel, and, improperly, swordfish.

f low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.

A certain surface of the third degree, described by a moving straight line; -- used to illustrate the motions of a rigid body and also the forces acting on the body.

Labor hired or performed by the day. Milton.

The twelfth and last month of the year, containing thirty-one days. During this month occurs the winter solstice.

French and American notation, a thousand involved to the eleventh power, or a unit with thirty-three ciphers annexed. [See the Note under Numeration.]

, a floor which serves also as a roof, as of a belfry or balcony. -- Deck hand, a sailor hired to help on the vessel's deck, but not expected to go aloft. -- Deck molding (Arch.), the molded finish of the edge of a deck, making the junction with the lower slope of the roof. -- Deck roof (Arch.), a nearly flat roof w…

e language from another. Johnson. This process, by which from two statements we deduce a third, is called deduction. J. R. Seely.

g the proximity of blood; one remove in the chain of relationship; as, a relation in the third or fourth degree. In the 11th century an opinion began to gain ground in Italy, that third cousins might marry, being in the seventh degree according to the civil law. Hallam.

A kind of novation by which a debtor, to be liberated from his creditor, gives him a third person, who becomes obliged in his stead to the creditor, or to the person appointed by him. Pothier.

A kind of ordnance, carrying a ball weighing from thirty to thirty-six pounds. Shak.

A kind of ordnance, carrying a ball weighing from nine to thirteen pounds.

A short note, equal in time to the half of a semiquaver, or the thirty-second part of a whole note.