sand shark

from The Century Dictionary.

• noun A small voracious shark, Odontaspis or Carcharias littoralis, also called shovelnose. The name extends to all the Carchariidæ as restricted by Jordan, by most writers called Odontaspididæ.
• noun Same as blind shark.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun shallow-water shark with sharp jagged teeth found on both sides of Atlantic; sometimes dangerous to swimmers