selachian

noun

se·​la·​chi·​an sə-ˈlā-kē-ən 

: any of a variously classified group (Selachii) of cartilaginous fishes that includes the existing sharks and typically most related elasmobranchs (such as rays)

selachian adjective

Word History

Etymology

ultimately from Greek selachos cartilaginous phosphorescent fish; akin to Greek selas brightness

First Known Use

1835, in the meaning defined above