(slang) A homosexual.

A small American spider (Hyptiotes cavatus) that lives among the dead branches of evergreen trees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fiber. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes in contact with it.

A region of Thailand, Laos, Myanmar, famous for production of opium and heroin. / A region of Victoria, Australia, where the Victorian Gold Rush occurred.

(graph theory) Of an undirected graph in which no three vertices form a triangle of edges.

plural of Brocard triangle

The triangle formed by joining the points of intersection of the lines from each vertex of a triangle to its Brocard points.

plural of Kanizsa triangle

An optical illusion in which a number of spatially separated fragments give the illusory impression of the contours of a triangle.

(automotive) a triangle made of usually red reflective material, used to warn other road users of a broken-down vehicle

plural of warning triangle