CATHETUS

‖Cath″e‐tus (?), n.; pl. catheti (#). [[L., fr. Gr. � a perpendicular line, fr. � let down, fr. �. See Catheter.]] (Geom.) One line or radius falling perpendicularly on another; as, the catheti of a right-angled triangle, that is, the two sides that include the right angle. Barlow.