The British spelling meaning to insert a catheter into a body part, typically a blood vessel or the bladder, for medical purposes.
From 'catheter' plus the '-ise' suffix (British form of '-ize'). Became standard medical terminology in the 19th and 20th centuries.
The technique of catheterization is so important that doctors in many countries use it thousands of times daily—it's one of the most common medical procedures performed worldwide.
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