Cathetus

‖n.; pl. catheti [ L., fr. Gr. &unr_; a perpendicular line, fr. &unr_; let down, fr. &unr_;. 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. [ 1913 Webster ]

n. [ L., fr. Gr. &unr_; a thing let down or put in, catheter, fr. &unr_; to send down, to let down; &unr_; + &unr_; to send. ] (Med.) The name of various instruments for passing along mucous canals, esp. applied to a tubular instrument to be introduced into the bladder through the urethra to draw off the urine. [ 1913 Webster ]

Eustachian catheter. See under Eustachian. --
Prostatic catheter, one adapted for passing an enlarged prostate. [ 1913 Webster ]