-kēˌī noun plural
Usage: capitalized
Etymology: New Latin, irregular from selachos cartilaginous fish; akin to Greek selas light, brightness — more at selen-
in some classifications : a variously delimited group of elasmobranch fishes:
a. : a primary division of Pisces that includes all the elasmobranchs and is equivalent to Chondrichthyes
b. : a class or subclass that includes all the elasmobranchs except the chimaeras
c. : a subclass or order that includes the existing sharks and rays as distinguished from the extinct Pleuropterygii and Ichthyotomi
d. : a suborder that includes the existing sharks as distinguished from the rays and is equivalent to Pleurotremata