(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."
2.
(Mythology) A mythical monster of varying descriptions; an ogre. "Goblins, hobgoblins, and orcs of the worst description."