plural koi
: a carp (Cyprinus carpio) bred especially in Japan for large size and a variety of colors and often stocked in ornamental ponds

Examples of koi in a Sentence

Recent Examples on the Web
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While Toyosu is a bit out of the way, Planets is the larger and more immersive of the two, with engaging exhibits that include a room full of digital koi in knee-deep water, a forest of dangling orchids, and rooms of video game-like physical challenges to jump, balance, or wiggle through. Jessica Kozuka, Travel + Leisure, 13 Mar. 2026 Japanese Friendship Garden of Phoenix A tranquil slice of heaven with grey stones, glittering koi and green bonsai trees. Trenesha Striggles, AZCentral.com, 18 Feb. 2026 My personal pets are the most beautiful koi fish given to me by a friend of mine who raises them. Eileen Finan, PEOPLE, 26 Nov. 2025 The only downside is losing a few koi, but, thankfully, the wildlife tends to steer clear of us during the day. Jack Beresford, MSNBC Newsweek, 20 Aug. 2025 See All Example Sentences for koi

Word History

Etymology

Japanese

First Known Use

1727, in the meaning defined above

Time Traveler
The first known use of koi was in 1727

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Cite this Entry

“Koi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/koi. Accessed 4 Apr. 2026.

Kids Definition

koi

noun
: a carp that has been bred to be of various bright colors and is often stocked in ornamental ponds

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