plural of algebraic extension

plural of Galois extension

plural of under-extension

plural of over-extension

plural of Buck's extension

plural of life extension

plural of prototype extension

A short series of text characters at the end of a computer filename, used to indicate the type of contents and the software that will be required to operate or open it.

(nautical) An attachment to the tiller that enables the helmsman to steer from further forward on the boat.

(electronics, US) An electrical cord with a plug one end, and a single socket or a multi-port socket at the other end, used for powering one or more devices at a distance, too far from the wall outlet to be reached by the normal cords of the device or devices.