racker

from WordNet (r) 3.0 (2006)
racker
    n 1: an attendant who puts pool or billiard balls into a rack
from The Collaborative International Dictionary of English v.0.48
Racker \Rack"er\ (r[a^]k"[~e]r), n.
   1. One who racks.
      [1913 Webster]

   2. A horse that has a racking gait.
      [1913 Webster]
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