Webster’s Revised Unabridged Dictionary · 1913
Catheter
Cath′e·ter (kăth′ē·tẽr), n. [L., fr. Gr. καθετήρ a thing let down or put in, catheter, fr. καθιέναι to send down, to let down; κατά + ἱέναι 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.
Eustachian catheter. See under Eustachian. — Prostatic catheter, one adapted for passing an enlarged prostate.