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d atoms; tetravalent; -- said of certain atoms and radicals; thus, carbon and silicon are quadrivalent elements.

Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp.

Having four valves; quadrivalve.

One of the four "liberal arts" making up the quadrivium.

The four "liberal arts," arithmetic, music, geometry, and astronomy; -- so called by the schoolmen. See Trivium.

The offspring of a mulatto and a white person; a person quarter-blooded. [Written also quarteron, quarteroon, and quateron.]

A tetroxide. [R.]

ot is usually prehensile, and the great toe opposable somewhat like a thumb. Formerly the Quadrumana were considered an order distinct from the Bimana, which last included man alone.

One of the Quadrumana.

Having four hands; of or pertaining to the Quadrumana.

Having four feet.

Having four feet; of or pertaining to a quadruped.

An aëroplane with four superposed main supporting surfaces.

Fourfold; as, to make quadruple restitution; a quadruple alliance. Quadruple time (Mus.), that in which each measure is divided into four equal parts.

A collection or combination of four of a kind.

Fourfold; folded or doubled twice. Quadruplex system (Electric Telegraph), a system by which four messages, two in each direction, may be sent simultaneously over the wire.

To make fourfold; to double twice; to quadruple.

The act of making fourfold; a taking four times the simple sum or amount.

To a fourfold quantity; so as to be, or cause to be, quadruple; as, to be quadruply recompensed.

Inquire; question; see; -- used to signify doubt or to suggest investigation.