catheter

American  

[kath-i-ter] / ˈkæθ ɪ tər /

noun

Medicine/Medical.

catheters plural

1. a flexible or rigid hollow tube employed to drain fluids from body cavities or to distend body passages, especially one for passing into the bladder through the urethra to draw off urine or into the heart through a leg vein or arm vein for diagnostic examination.

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catheter British  

/ ˈkæθɪtə /

noun

1. med a long slender flexible tube for inserting into a natural bodily cavity or passage for introducing or withdrawing fluid, such as urine or blood

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catheter Scientific  

/ kăth′ĭ-tər /

1. A hollow, flexible tube inserted into a body cavity, duct, or vessel to allow the passage of fluids or distend a passageway.

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catheter Cultural  

1. A thin tube inserted into one of the channels or blood vessels in the body to remove fluids, create an opening into an internal cavity, or administer injections.

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Other Word Forms

Noun Inflected Forms

• catheters
  plural

Etymology

Origin of catheter

1595–1605; < Late Latin < Greek kathetḗr kind of tube, literally, something sent or let down, equivalent to kathe- (variant stem of kathiénai, equivalent to kat- cata- + hiénai to send, let go) + -tḗr agent suffix

Compare meaning

How does catheter compare to similar and commonly confused words? Explore the most common comparisons:

• cannula vs. catheter

Explanation

A catheter is a thin, flexible tube that's inserted into the body to draw liquids out or keep a pathway open. It’s the kind of thing you’d get in the hospital. The word catheter is from the Greek kathienai which means, "thrust in or let down." That’s what happens when that small tube goes into your body and lets fluid out. If you have surgery in the belly area, you’ll probably need a catheter to drain the urine until you can go to the bathroom by yourself again. A catheter can also be inserted into other organs, like through a blood vessel and into the heart, to see what's going on.

Example Sentences

See Examples For:

catheter catheters

During the procedure, an interventional radiologist uses a thin catheter to reach the affected blood vessels and injects tiny particles that block blood flow to them.

From Science Daily ● Jun. 17, 2026

Separately, Medtronic on Wednesday also raised its quarterly dividend by a penny and said it has made strategic investments into two privately held companies focused on the development of intracardiac echocardiography, or ICE, catheter technologies.

From The Wall Street Journal ● Jun. 3, 2026

It is approved for use only via a catheter, not through injections, and in combination with Bacillus Calmette-Guérin immunotherapy.

From Barron's ● Mar. 24, 2026

The experimental therapy is administered through a catheter inserted into tiny holes in the skull.

From MarketWatch ● Mar. 9, 2026

He wouldn’t allow a fixed catheter and insisted that they help him urinate each and every time he had to go.

From "Endgame" by Frank Brady

CMS has also flagged fraud in traditional Medicare hospice care and purchases of medical equipment like catheters.

From The Wall Street Journal ● Apr. 9, 2026

Edwards’ focus is cardiac catheters and TAVR, or transcatheter aortic valve replacement.

From Barron's ● Jan. 23, 2026

In earlier studies, scientists sometimes inserted catheters into veins in a patient's neck to collect blood as it left the brain.

From Science Daily ● Dec. 17, 2025

The risk of infection is especially high for patients with catheters, breathing tubes or feeding tubes because they create direct entry points for C. auris to enter the bloodstream or lungs.

From Los Angeles Times ● Mar. 27, 2025

The nurses work rapidly to detach the monitors and catheters and run another tube down my throat.

From "If I Stay" by Gayle Forman