orc n.
  1. Zool. Any of several cetaceans, especialy the grampus (Grampus griseus) of the dolphin family. [Written also ork and orch.]
  An island salt and bare,
  The haunt of seals, and orcs, and sea-mews' clang.   --Milton (Par. Lost xi. 835).
     Goblins, hobgoblins, and orcs of the worst description.   --J. J. Tolkien (The Hobbit)
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