koi /kɔɪ/ noun1 •Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring.We sense that while it might be wonderful for Krystle and Alexis to have a catfight in a koi pond, it would be inappropriate for Joan to smack Linda with a koi. — 1985 formsKOIs
