DICT.TW Dictionary Taiwan

 Sleep·er n.
 1. One who sleeps; a slumberer; hence, a drone, or lazy person.
 2. That which lies dormant, as a law. [Obs.]
 3. A sleeping car. [Colloq. U.S.]
 4. Zool. An animal that hibernates, as the bear.
 5. Zool. (a) A large fresh-water gobioid fish (Eleotris dormatrix). (b) A nurse shark. See under Nurse.