Quadrilateral vs. Trapezoid

Quadrilateralnoun

A polygon with four sides.

Trapezoidnoun

A (convex) quadrilateral with two (non-adjacent) parallel sides.

Quadrilateralnoun

An area defended by four fortresses supporting each other.

‘The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.’;

Trapezoidnoun

A convex quadrilateral with no sides parallel and no equal sides.

Quadrilateraladjective

having four sides.

Trapezoidnoun

(anatomy) The trapezoid bone of the wrist.

Quadrilateraladjective

Having four sides, and consequently four angles; quadrangular.

Trapezoidnoun

A plane four-sided figure, having two sides parallel to each other.

Quadrilateralnoun

A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

Trapezoidnoun

A bone of the carpus at the base of the second metacarpal, or index finger.

Quadrilateralnoun

An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.

Trapezoidadjective

Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.

Quadrilateralnoun

a four-sided polygon

Trapezoidadjective

Of or pertaining to the trapezoid ligament; as, the trapezoid line.

Quadrilateraladjective

having four sides

Trapezoidnoun

a quadrilateral with two parallel sides

Quadrilateral

A quadrilateral is a polygon in Euclidean plane geometry with four edges (sides) and four vertices (corners). Other names for quadrilateral include quadrangle (in analogy to triangle) and tetragon (in analogy to, e.g., pentagon or hexagon).

Trapezoidnoun

the wrist bone between the trapezium and the capitate bones

Trapezoid

In Euclidean geometry, a convex quadrilateral with at least one pair of parallel sides is referred to as a trapezium () in English outside North America, but as a trapezoid () in American and Canadian English. The parallel sides are called the bases of the trapezoid and the other two sides are called the legs or the lateral sides (if they are not parallel; otherwise there are two pairs of bases).