nounpl. killifish killifish or kil·li·fish·es
Any of numerous small fishes of the family Fundulidae and related families of the order Cyprinidontiformes, chiefly inhabiting fresh and brackish waters in warm regions and popular in home aquariums.
Origin of killifishPerhaps kill2 + fish.
(plural killifishes or killifish)
- Any of a number of tiny fish in the Cyprinodontiformes order of ray-finned fish.
Variant of killifish