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A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.

n; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers.

A strap of leather; especially, one used for fastening anything. And nails for loosened spears, and thongs for shields, provide. Dryden. Thong seal (Zoöl.), the bearded seal. See the Note under Seal.

A leather strap supporting the body of a carriage, and attached to springs, or serving as a spring. See Illust. of Chaise.

A strap of a bridle, halter, or the like, passing under a horse's throat.

Showy to excess; gaudy; specious; superficial. "Tinsel trappings." Milton.

A large ironbound block strapped with a hook, and, when used, hung to an eyebolt in the cap, -- used in swaying and lowering the topmast. Totten.

One of two straps, chains, or ropes of a harness, extending from the collar or breastplate to a whiffletree attached to a vehicle or thing to be drawn; a tug.

Hence, something tied to a lure to entice a hawk; also, a trap for an animal; a snare. Halliwell. With cunning trains him to entrap un wares. Spenser.

A snare; a trapan. Snares and trepans that common life lays in its way. South.

gonal 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.

approach of an enemy, and having a pointed stake in the middle. The pits are called also trapholes.

A trace, or drawing strap, of a harness.

A strap placed across a man's forehead to assist him in carrying a pack on his back. [Local, U. S.] Bartlett.

A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.

Indies. When fresh the color is purple or yellow, or a mixture of the two. -- Venus's flytrap. (Bot.) See Flytrap, 2. -- Venus's girdle (Zoöl.), a long, flat, ribbonlike, very delicate, transparent and iridescent ctenophore (Cestum Veneris) which swims in the open sea. Its form is due to the enormous development of t…

A surcingle, or strap of leather, used for binding a load upon the back of a beast; also, a leather tie; a short wagon rope. [Prov. Eng.]

the like. -- Waste steam. (a) Steam which escapes the air. (b) Exhaust steam. -- Waste trap, a trap for a waste pipe, as of a sink.

The fruit of Trapa natans and Trapa bicornis, Old World water plants bearing edible nutlike fruits armed with several hard and sharp points; also, the plant itself; -- called also water caltrop.

ks from injury by the weather when stowed in the nettings. -- Weather door. (Mining) See Trapdoor, 2. -- Weather gall. Same as Water gall, 2. [Prov. Eng.] Halliwell. -- Weather house, a mechanical contrivance in the form of a house, which indicates changes in atmospheric conditions by the appearance or retirement of…