any of various colorful cultivated forms of the common carp, Cyprinus carpio, apparently originating in Japan and other parts of eastern temperate Asia.

Origin of koi

1720–30; < Japanese, earlier kowi < kofi, Old Japanese kwofi < *kwopi carp
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British Dictionary definitions for koi



any of various ornamental forms of the common carp

Word Origin for koi

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for koi

1727, from a Japanese local name for "carp."

Online Etymology Dictionary, © 2010 Douglas Harper