资料来源 : Webster's Revised Unabridged Dictionary (1913)

Plagiostomi \Pla`gi*os"to*mi\, n. pl. [NL., from Gr. ? slanting
   + ?, ?, mouth.] (Zo["o]l.)
   An order of fishes including the sharks and rays; -- called
   also {Plagiostomata}.