The area comprising the cities of Raleigh, Durham and Chapel Hill in North Carolina. Used with "the" except when attributive. / Ellipsis of Bermuda Triangle.

(geometry) A polygon with three sides and three angles. / (US, Canada) A set square.

plural of triangle

A largely tropical, Old World, erebid moth, Trigonodes hyppasia, with triangular markings on the wings.

Having three angles. / Located inside a triangle. / (heraldry) Divided into triangles (said of the field).

(geometry) A triangle having each of its three sides of different lengths.

(geometry) A triangle all of the angles of which are acute.

(geometry) A triangle one of whose angles is obtuse.

(geometry) A triangle having a right angle as one of its interior angles.

(geometry) A triangle having at least two sides equal.