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 conduit made of pipes used to convey water, gas or petroleum etc.
A channel (either physical or logical) by which information is transmitted sequentially (that is, the first information in is the first information out).
A system or process through which something is conducted.
The inside of a wave that a surfer is riding, when the wave has started closing over it.
To design (a microchip etc.) so that processing takes place in efficient stages, the output of each stage being fed as input to the next.
To connect a tube from ones mouth to ones anus (or the anus of another), in order to force someone to eat feces.
To convey something by a system of pipes
To lay a system of pipes through something