Definition of koi noun from the Oxford Advanced Learner's Dictionary

 

koi

 noun
noun
BrE BrE//kɔɪ//
 
; NAmE NAmE//kɔɪ//
 
(pl. koi) Fish
 
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a large fish originally from Japan, often kept in fish ponds See related entries: Fish Word Origin early 18th cent.: from Japanese, ‘carp’.
See the Oxford Advanced American Dictionary entry: koi