Cam n. : A turning or sliding piece which, by the shape of its periphery or face, or a groove in its surface, imparts variable or intermittent motion to, or receives such motion from, a rod, lever, or block brought into sliding or rolling contact with it.

Cam n. : A curved wedge, movable about an axis, used for forcing or clamping two pieces together.

Cam n. : A projecting part of a wheel or other moving piece so shaped as to give alternate or variable motion to another piece against which it acts.

Cam n. : A ridge or mound of earth.

Cam a. : Crooked.

Example:
What Cam and heads are good for a street performance 350?

Taxonomy
cams, reciprocating motion, rotary motion, free encyclopedia, base circle, camshaft, power, cam followers, eccentric wheel, cylinder, back and forth, motion, follower, hole, movement, automobile, intake, Al-Jazari.

Defination from the web:
Cam (disambiguation). Animation showing rotating cams and cam followers producing reciprocating motion. ... cams can be characterized by their displacement diagrams, which reflect the changing position a roller follower would make as the cam rotates about an axis. ...