The British spelling of the present participle of catheterize, meaning to insert or use a catheter in medical treatment.
From catheter (Greek katheter, 'thing inserted') plus the suffix -ise (British spelling of -ize), which comes from Greek -izein. The term evolved in medical practice during the 18th-19th centuries as the procedure became standardized.
In British English, medical procedures get the -ising ending while American doctors use -izing, but both are describing the same life-saving technique that's been around since ancient Egypt—evidence shows catheters were used thousands of years ago!
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