Căth'e-ter, n.

n. [Lat. catheter, Gr. καθετήρ, a thing let down or put in, from καθιέναι, to send down, to let down, from κατά, down, and ἱέναι, to send.] (Surg.) A tubular instrument to be introduced into the bladder to draw off the urine. Dunglison.