A wheel or drum fixed on a shaft and turned by a belt, cable, etc., for the application or transmission of power, or to guide the belt.

= mail chute n. at mail, n.2 compounds 3.

an inclined plane or trough for delivering sacks to a lower level.

A movable tube, widening at its upper end into a hopper, for depositing concrete under water.

a slide down which mail is sent to a main depository, esp. in an office or apartment block.