cam

Machinery. a disk or cylinder having an irregular form such that its motion, usually rotary, gives to a part or parts in contact with it a specific rocking or reciprocating motion.

Automotive Slang. camshaft.

to provide (a machine part or mechanism) with a cam or cams.

a camera, especially one that records video (often used in combination, as in digital cam traffic cam webcam ):

a river in E England flowing NE by Cambridge, into the Ouse River. 40 miles (64 km) long.

computer-aided manufacturing.

Cambridge.