A vent for the escape of steam or other gas.
A top-facing opening to a cavity in the ground very near an ocean's shore, leading to a marine cave from which wave water or bursts of air are expelled.
The spiracle, on the top of the head, through which cetaceans breathe.
A vertical opening in the top of a computer case that lets hot air (primarily from the CPU heat sink) escape quickly.
An unintended cavity filled with air in a casting product.
To fill or be filled with air in an unintended cavity.
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.