• (n.) The operation of introducing a catheter.
the employment or passage of a catheter.
Use or insertion of a tubular device into a duct, blood vessel, hollow organ, or body cavity for injecting or withdrawing fluids for diagnostic or therapeutic purposes. It differs from intubation in that the tube here is used to restore or maintain patency in obstructions. ... (12 Dec 1998) ... 
(kath″ә-tur″ĭ-za´shәn) passage of a catheter into a body channel or cavity. cardiac catheterization insertion of a catheter into a vein or artery and guiding of it into the interior of the heart in order to measure cardiac output, determine the oxygen content...
Type: Term Pronunciation: kath′ĕ-ter-ī-zā′shŭn Definitions: 1. Passage of a catheter.
Cardiac catheterization is a test used to explore the coronary arteries, using a fine tube (catheter) that's put into an artery or vein of an arm or leg and passed into the arteries of the heart. Can be used in the diagnosis of heart disease. (Read about 'Cardiovascular Tests' 'Coronary Heart Disease')
a technique in which a hollow, flexible tube is used to drain body fluids (such as urine), to introduce fluids into the body, or to examine or widen a narrowed vein or artery 
catheterisation noun the operation of introducing a catheter into the body
Passing a small tube through the urethra into the bladder to draw out the urine.