Triangle

trī′ang-gl, n. ( math. ) a plane figure with three angles and three sides: a musical instrument of percu ion, formed of a steel rod bent in triangle-form, open at one angle: a frame of three halberds stuck in the ground to which soldiers were formerly bound to be flogged (generally pl. ).— adjs. Trī′angled , Triang′ūlar , having three angles.— n. Triangūlar′ity .— adv. Triang′ūlarly .— v.t. Triang′ūlāte , to survey by means of a series of triangles.— adv. Triang′ūlātely .— n. Triangūlā′tion , act of triangulating: the series of triangles so used.— adj. Triang′ūloid . [Fr.,—L. triangulum — tres , three, angulus , an angle.]