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quotient of the first divided by the second is equal to that of the third divided by the fourth; -- called also geometrical proportion, in distinction from arithmetical proportion, or that in which the difference of the first and second is equal to the difference of the third and fourth.

A game of chance, in which four sea shells, each called a prop, are used instead of dice.

An order of aquatic amphibians having prominent external gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida.

beetles having the fifth tarsal joint minute and obscure, so that there appear to be but four joints. -- Pseu`do*te*tram"er*al, a.

of begetting or bearing children, usually considered, in temperate climates, to be about fourteen years in males and twelve in females.

The common puff adder (Vipera, or Clotho, arietans) is the largest species, becoming over four feet long. The plumed puff adder (C. cornuta) has a plumelike appendage over each eye. (b) A North American harmless snake (Heterodon platyrrhinos) which has the power of puffing up its body. Called also hog-nose snake, flath…

A boy or a girl under the age of puberty, that is, under fourteen if a male, and under twelve if a female.

The period before puberty, or from birth to fourteen in males, and twelve in females.

estess of Apollo, who delivered oracles at Delphi. Pythian games (Gr. Antiq.), one of the four great national festivals of ancient Greece, celebrated near Delphi, in honor of Apollo, the conqueror of the dragon Python, at first once in eight years, afterward once in four.

A plane figure having four angles, and consequently four sides; any figure having four angles.

Having four angles, and consequently four sides; tetragonal. -- Quad*ran"gu*lar*ly, adv.

A fourth part of the coin called an as. See 3d As, 2.

The fourth part; the quarter. [Obs.] Sir T. Browne.

Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space. Quadrantal triangle, a spherical triangle having one side equal to a quadrant or arc of 90º. -- Quadrantal versor, a versor that expresses rotation through one right angle.

Having four equal sides, the opposite sides parallel, and four right angles; square. Figures, some round, some triangle, some quadrate. Foxe.

Comprising four years; as, a quadrennial period.

Once in four years.

A space or period of four years.

A combining form meaning four, four times, fourfold; as, quadricapsular, having four capsules.

Having four capsules.