[1] : The Collaborative International Dictionary of English v.0.48

quaker \quak"er\, n.
   1. one who quakes.
      1913 webster

   2. one of a religious sect founded by george fox, of
      leicestershire, england, about 1650, -- the members of
      which call themselves friends. they were called quakers,
      originally, in derision. see friend, n., 4.
      1913 webster

            fox's teaching was primarily a preaching of
            repentance . . . the trembling among the listening
            crowd caused or confirmed the name of quakers given
            to the body; men and women sometimes fell down and
            lay struggling as if for life.        --encyc. brit.
      1913 webster

   3. zool.
      a the nankeen bird.
      b the sooty albatross.
      c any grasshopper or locust of the genus edipoda; --
          so called from the quaking noise made during flight.
          1913 webster

   quaker buttons. bot. see nux vomica.

   quaker gun, a dummy cannon made of wood or other material;
      -- so called because the sect of friends, or quakers, hold
      to the doctrine, of nonresistance.

   quaker ladies bot., a low american biennial plant
      houstonia caerulea, with pretty four-lobed corollas
      which are pale blue with a yellowish center; -- also
      called bluets, and little innocents.
      1913 webster
see also:
fox friend edipoda quaker buttons nux vomica quaker gun 
quaker ladies houstonia caerulea bluets little innocents 

[2] : WordNet (r) 2.0

quaker gun
     n : a dummy gun or piece of artillery made usually of wood

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