Plural of catheter; flexible or rigid tubes inserted into body cavities or blood vessels for medical examination or treatment.
From Greek katheter (from kathienai, 'to send down, insert'). The word entered English in the 15th century and catheters themselves have been used in medicine for over 2,000 years.
Modern catheters are engineering marvels—some are only 2 millimeters thick and can be guided through arteries to deliver medicine, repair damage, or remove blockages with incredible precision!
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