Etymology
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elasmobranch (n.)

1859, from Elasmobranchii, class of fishes that includes sharks and rays, from combining form of Greek elasmos "metal plate," from elan "to strike" (see elastic) + brankhia "gill." So called from their plate-like gills.

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Definitions of elasmobranch

elasmobranch (n.)
any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates;
Synonyms: selachian
From wordnet.princeton.edu