orca

Etymology

Borrowed from Latin orca (“tun, cask; whale”), see there for more. Although the origin is obscure, the sometimes-cited association with orcus (“underworld”) is folk-etymology. Doublet of orc.

noun

1. A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly called the killer whale.
   In the summer, when the weather is calm and beautiful, large flocks of orcæ can be seen approaching the shallow places near the shore, or between the numerous islands of the White Sea. Several fishermen associate for hunting orcæ, each one furnishing a boat, and a large seine made of cords of the thickness of a finger, the meshes being 10½ inches square. 1876, Alexander Schultz, “Account of the Fisheries and Seal-Hunting in the White Sea, the Arctic Ocean, and the Caspian Sea”, in United States Commission of Fish and Fisheries. Part III. Report of the Commissioner for 1873-4 and 1874-5., Washington, D.C.: Government Printing Office, page 55