- belonging or pertaining to the Elasmobranchii, the subclass of cartilaginous fishes comprising the sharks and rays.
- an elasmobranch fish.
- any cartilaginous fish of the subclass Elasmobranchii (or Selachii), which includes the sharks, rays, dogfish, and skates
- of, relating to, or belonging to the Elasmobranchii
- Any of numerous cartilaginous fishes of the subclass Elasmobranchii, having five to seven gill slits on each side, dermal denticles for scales, and a small respiratory opening (spiracle) behind each eye. The pectoral fins of elasmobranchs are often greatly enlarged. Elasmobranchs include the sharks, rays, and skates.