conduit

Concise Oxford English Dictionary © 2008 Oxford University Press:
conduit /ˈkɒndɪt, -jʊɪt/

▶noun

• 1 a channel for conveying water or other fluid.

• 2 a tube or trough protecting electric wiring.

– origin ME: from OFr., from med. L. conductus, from L. conducere (see conduct).