Pronunciation: (flag'fish"),[key] —n., —pl.(esp. collectively)-fish,(esp. referring to two or more kinds of species)-fish•es. 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.