Webster's English Dictionary

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catheter

cath.e.ter \'kath-*t-*r\ n [LL, fr. Gk kathete-r, fr. kathienai to send 
   down, fr. kata-)X cata- + hienai to send - more at JET : a tubular medical 
   device for insertion into canals, vessels, passageways , or body cavities 
   usu. to permit injection or withdrawal of fluids or to keep a passage open