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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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.
 

From: WordNet (r) 2.0

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