An idle pulley for guiding a belt which transmits motion between shafts that are not parallel.

(idiomatic) To do something surprising and beneficial that is unexpected.

A kind of non-sinusoidal waveform that is similar to a square wave but lacks the perfectly symmetrical shape.

An instrument consisting of a glass tube with terminal bulbs, and containing ether or alcohol, which the heat of the hand causes to boil.

plural of pull-back

Alternative form of pilaf

plural of pull cord

a cord used to operate a ceiling-mounted or wall-mounted electrical device, such as a light switch.

Alternative form of Jack-in-the-pulpit

(of a person) To be struggling with poverty, constantly in money difficulties.