Perpendicular

in geometry, a line standing upon another line, so as to make equal angles on each side, or a right angle on either side. - PERPENDICULAR OF A'CONIC SECTION GR CURVE. See Curve and NorMAL. PzRpENDICULAR, in gunnery, is a small instrument, used for finding the centre line of apiece in the operation of pointing it to a given object.