draft tube

noun

1. the flared passage leading vertically from a water turbine to its tailrace.

Word History and Origins

Origin of draft tube¹

First recorded in 1840–50

Example Sentences

Fish then enter a draft tube or swim under a gate, where there is a rapid decompression and water surge.

From Forbes

This home appliance doubles as a piece of furniture, with holes for a draft tube, start button and air vent.

From Time Magazine Archive