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n. pl. koi
A variety of carp (Cyprinus carpio) developed in Japan and widely raised as an ornamental fish for its bright color patterns.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Animals) any of various ornamental forms of the common carp
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. kois, koi.
any colorful form of the common carp, Cyprinus carpio, cultivated for garden ponds, esp. in Japan.
[1720–30; < Japanese]
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