A pipe or channel for conveying water, etc.
A duct or tube into which electrical cables may be pulled; a type of raceway.
A means by which something is transmitted.
An investment vehicle that issues short-term commercial paper to finance long-term off-balance sheet bank assets.
An adjustable gate or valve used to control the flow of water through a sluice.
Anything that controls or limits an outpouring of people, emotion etc.