• WordNet 3.6
    • n selachian any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates
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Webster's Revised Unabridged Dictionary
    • n Selachian (Zoöl) One of the Selachii. See Illustration in Appendix.
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Century Dictionary and Cyclopedia
    • selachian Resembling or related to a shark of the genus Selache; pertaining to the Selachii, or having their characters; squaloid or raioid; plagiostomous; in the broadest sense, elasmobranchiate. See also cuts under Elasmobranchii, saw-fish, shark, and skate.
    • n selachian A shark or other plagiostomous fish; any elasmobranch.
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In literature:

The Fishes of the Jurassic sea were exceedingly numerous, but were all of the Ganoid and Selachian tribes.
"Atlantic Monthly, Vol. 12, August, 1863, No. 70" by Various
Of the archipallium, the portion which constitutes the olfactory lobe is well formed in the selachian fish.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4" by Various
This may hang freely in the splanchnocoele or may be, as in many Selachians, imbedded in the liver substance.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
It is the same for the Selachians and Batrachians.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour