rocker arm
         n 1: a lever pivoted at the center; used especially to push a
               valve down in an internal-combustion engine [syn: {rocker
               arm}, {valve rocker}]

English Dictionary: rocker arm	by the DICT Development Group
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Reassurer \Re`as*sur"er\, n.       One who reassures.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Requirer \Re*quir"er\ (-kw?r"?r), n.       One who requires.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Rocker \Rock"er\, n.       1. One who rocks; specifically, one who rocks a cradle.                         It was I, sir, said the rocker, who had the honor,                      some thirty years since, to attend on your highness                      in your infancy.                                 --Fuller.          2. One of the curving pieces of wood or metal on which a             cradle, chair, etc., rocks.          3. Any implement or machine working with a rocking motion, as             a trough mounted on rockers for separating gold dust from             gravel, etc., by agitation in water.          4. A play horse on rockers; a rocking-horse.          5. A chair mounted on rockers; a rocking-chair.          6. A skate with a curved blade, somewhat resembling in shape             the rocker of a cradle.          7. (Mach.) Same as {Rock shaft}.          {Rocker arm} (Mach.), an arm borne by a rock shaft.