The Collaborative International Dictionary
Notidanian
Notidanian \No`ti*da"ni*an\, n. [Gr. ? back + ? comely.] (Zo["o]l.) Any one of several species of sharks of the family Notidanid[ae], or Hexanchid[ae]. Called also cow sharks. See Shark.
Wiktionary
notidanian
n. (context zoology English) Any of various sharks of the family Notidanidae or Hexanchidae.