Koi Definition
 koi 
  kois
  
    noun
  
 A large, colorful variety of carp (Cyprinus carpio) bred mostly in Japan for display in ornamental ponds.
 Webster's New World 
Origin of Koi
-  
From Japanese 鯉 (koi).
From Wiktionary
 Japanese carp
From American Heritage Dictionary of the English Language, 5th Edition
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