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2 definitions found
 for rocker arm
From The Collaborative International Dictionary of English v.0.48 :

  Rocker \Rock"er\, n.
     1. One who rocks; specifically, one who rocks a cradle.
        [1913 Webster]
              It was I, sir, said the rocker, who had the honor,
              some thirty years since, to attend on your highness
              in your infancy.                      --Fuller.
        [1913 Webster]
     2. One of the curving pieces of wood or metal on which a
        cradle, chair, etc., rocks.
        [1913 Webster]
     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.
        [1913 Webster]
     4. A play horse on rockers; a rocking-horse.
        [1913 Webster]
     5. A chair mounted on rockers; a rocking-chair.
        [1913 Webster]
     6. A skate with a curved blade, somewhat resembling in shape
        the rocker of a cradle.
        [1913 Webster]
     7. (Mach.) Same as Rock shaft.
        [1913 Webster]
     Rocker arm (Mach.), an arm borne by a rock shaft.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  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]

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