Webster's Revised Unabridged Dictionary · 1913

orc

orc (ôrk) , noun

[Latin orca, a kind of whale: compare French orque.]

1.
(Zoology) Any of several cetaceans, especially the grampus (Grampus griseus) of the dolphin family. — Milton
An island salt and bare, The haunt of seals, and orcs, and sea-mews' clang. — Milton (Par. Lost xi. 835)
2.
(Mythology) A mythical monster of varying descriptions; an ogre.
Goblins, hobgoblins, and orcs of the worst description. — J. J. Tolkien (The Hobbit)
3.
The orca.