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Having a valence of four; quadrivalent; tetravalent; sometimes, in a specific sense, having four hydroxyl groups, whether acid or basic.

The quality or state of being tetravalent; quadrivalence.

Having a valence of four; tetratomic; quadrivalent.

An oxide having four atoms of oxygen in the molecule; a quadroxide; as, osmium tetroxide, OsO.

s dinosaurs in which the feet are less birdlike, and hence more like those of an ordinary quadruped, than in the Ornithopoda. It includes the repacious genera Megalosaurus, Creosaurus, and their allies.

The fragrant and beautiful wood of a North African tree (Callitris quadrivalvis), formerly called Thuja articulata. The tree is of the Cedar family, and furnishes a balsamic resin called sandarach. Rev. xviii. 12.

ively, a real battle. "In battle and in tourneyment." Chaucer. With cruel tournament the squadrons join. Milton.

of removing from one locality to another. "The transportal of seeds in the wool or fur of quadrupeds." Darwin.

To distribute into tribes or classes. [R.] Our fowl, fish, and quadruped are well tribed. Abp. Nicolson.

Having three right angles. See Triquadrantal.

ace of an octahedron. Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron. -- Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.

To proceed by a certain gait peculiar to quadrupeds; to ride or drive at a trot. See Trot, n.

organ in which milk is secreted and stored; -- popularly called the bag in cows and other quadrupeds. See Mamma. A lioness, with udders all drawn dry. Shak.

Any hoofed quadruped; one of the Ungulata.

One of the sights of a compass, quadrant, etc. Vane of a leveling staff. (Surv.) Same as Target, 3.

angular distance of the moon from the sun. It is greater at the octants, and zero at the quadratures. -- Variation of the needle (Geog. & Naut.), the angle included between the true and magnetic meridians of a place; the deviation of the direction of a magnetic needle from the true north and south line; -- called als…

Having a backbone, or vertebral column, containing the spinal marrow, as man, quadrupeds, birds, amphibia, and fishes.

An American fresh-water mussel (Quadrula pustulosa). Its shell is used in making buttons.

A large sting ray (Rhinoptera bonasus, or R. quadriloba) of the Atlantic coast of the United States. Its snout appears to be four- lobed when viewed in front, whence it is also called cow-nosed ray.