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.

(slang) A homosexual.

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.

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

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

(geometry) Any of a number of triangles described in Morley's trisector theorem, especially the equilateral triangle formed from the points of intersection of adjacent angle trisectors of a given triangle.

(geology) A depression caused by the Afar Triple Junction, which is part of the Great Rift Valley in East Africa.

(anatomy) A triangular region that is a landmark in the neck, has its apex above at the occipital bone, and is bounded in front by the sternocleidomastoid muscle, behind by the anterior margin of the trapezius, and inferiorly by the middle third of the clavicle.