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

(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.

(automotive) a chain which connects the crankshaft and the camshaft(s) of an engine, synchronising the operation of the inlet and exhaust valves.

(nautical) A space in the forward part of the ship, typically beneath the bow in front of the foremost collision bulkhead, that contains the anchor chain when the anchor is secured for sea.

plural of chain complex

(organic chemistry) Describing any aliphatic compound that contains a chain of carbon atoms all of which are connected to either one or two others.

(organic chemistry) Describing any aliphatic compound that contains a chain of carbon atoms in which at least one carbon atom is connected to three or four others, thus forming a branch.

plural of chain-smoker

(algebraic topology) A sequence of Abelian groups, together with a sequence of boundary homomorphisms.

Alternative spelling of keychain