Definition that contains aquatic vertebrate
- fish any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
- cyclostome primitive aquatic vertebrate
- order cyclostomata primitive jawless aquatic vertebrate: lampreys; hagfishes
- tail fin the tail of fishes and some other aquatic vertebrates
- cyclostomata primitive jawless aquatic vertebrate: lampreys; hagfishes
- caudal fin the tail of fishes and some other aquatic vertebrates
- dorsal fin unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance