1.Definition: 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"

Category: Objects

2.Definition: a swollen bruise caused by a blow to the eye

Related Noun(s):shiner

Category: General

3.Definition: any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails

Category: Animals

4.Definition: person who is quiet or timid

Category: People