'Racker' definitions:

Definition of 'racker'

From: WordNet
noun
An attendant who puts pool or billiard balls into a rack

Definition of 'Racker'

From: GCIDE
  • 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]