Definition of selachian in US English:

selachian

noun

Zoology
  • An elasmobranch fish of a group that comprises the sharks and dogfishes.

    The former group Selachii, subclass Elasmobranchii: now treated as one, two, or three superorders

    • ‘Those produced by the hypochordal lobe of the caudal fin of selachians and early bony fishes have been studied in detail.’
    • ‘Lack of neural spine is consistent with selachians (a group of vertebrates which includes sharks and rays).’
    • ‘Fish included many elasmobranchs as well as osteichthyes such as palaeoniscoids, dipnoi, selachians, and crossopterygians, together with the ancient acanthodians.’

adjective

Zoology
  • Relating to the selachians.

    • ‘The A. alatus specimens were collected from tuffaceous fine-grained sandstones that overlay the very fossiliferous yellowish tuffs containing abundant remains of bivalves, echinoids, whale vertebrae, and selachian teeth.’

Origin

Mid 19th century: from modern Latin Selachii (from Greek selakhos ‘shark’) + -an.

Pronunciation

selachian

/səˈleɪkiən//səˈlākēən/