plural of challenge coin

An item of exercise equipment that supports the body during exercise of the lower back and sometimes the gluteal muscles, hamstring, and abdominals.

plural of chain drive

A type of chain drive used to transmit mechanical power in many kinds of machinery, such as conveyors and bicycles, consisting of a series of short cylindrical rollers held together by side links and driven by a sprocket.

plural of chamber lamp

An oil lamp designed for indoor use. / An indicator light associated with a chamber.

(Canada, politics, informal, sometimes capitalized) The assembly hall in which the Senate of Canada convenes; (metonymically) the Senate of Canada itself.

(cycling) The tendency of a chain to stick to chainrings and be sucked up into the bicycle instead of coming off the chainring, especially if it is worn or if conditions are dirty.

(cycling) The slapping sound of the bicycle's chain against the chainstays while riding over rough terrain.

(UK) Synonym of sidewalk chalk