What is "eleotris dormatrix"

Sleeper \Sleep"er\, n.

1. One who sleeps; a slumberer; hence, a drone, or lazy person.

2. That which lies dormant, as a law. [Obs.]
   --Bacon.

3. A sleeping car. [Colloq. U.S.]

4. (Zo["o]l.) An animal that hibernates, as the bear.

5. (Zo["o]l.)

   1. A large fresh-water gobioid fish ( Eleotris dormatrix).

   2. A nurse shark. See under Nurse.