σέλαχ-ος,εος,τό, mostly in pl.σελάχη,τά ,
A. the cartilaginousorelasmobranch fishes, sharksandrays, Arist. HA 505a1 , 511a5 , al.; ἰχθύσι σελάχεσι
Hp. Morb. 2.50
, etc. (Some derived the name fromσέλας, because fishes of this kind emit a phosphorescent light, Gal. 6.737 .)