A pair of orcas.Licensed from iStockPhoto
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Origin: Latin ōrca, whale, probably alteration (probably influenced by ōrca, vessel) of Greek orux, orug-, pickax, a kind of large fish or whale, perhaps from orussein, to dig.