/flag"fish'/ , n. , pl. ( esp. collectively ) flagfish , ( esp. referring to two or more kinds of species ) flagfishes .
1. Also called American flagfish . a killifish, Jordanella floridae, inhabiting swamps and streams of Florida, having a blue-brown back and whitish sides with red stripes, often kept in aquariums.
2. any of several other brightly colored fishes.
[ FLAG 1 + FISH ]