Wordnet 3.0
NOUN (1)
1. 
 a hand-operated electronic device that controls the coordinates of a cursor on your computer screen as you move it around on a pad; 
 on the bottom of the device is a ball that rolls on the surface of the pad; 
- Example: "a mouse takes much more room than a trackball"[syn: mouse, computer mouse]
WordNet (r) 3.0 (2006):
computer mouse
    n 1: a hand-operated electronic device that controls the
         coordinates of a cursor on your computer screen as you move
         it around on a pad; on the bottom of the device is a ball
         that rolls on the surface of the pad; "a mouse takes much
         more room than a trackball" [syn: mouse, computer
         mouse]