noun [C] plural mice
a small device which you move across a surface in order to move a pointer on your computer screen
Cambridge Advanced Learner's Dictionary http://dictionary.cambridge.org/define.asp?ke...
—n., pl. micePronunciation: (mīs), [key]
4. Computers.a palm-sized, button-operated device that can be slid on wheels or ball bearings over a desktop to move the cursor on a CRT to any position, or slid over a drawing in order to recreate the drawing on a CRT. Cf. joystick (def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. http://www.infoplease.com/dictionary/mouse
"Mice" and "mouses"
The fourth (current as of 2006) edition of The American Heritage Dictionary of the English Language endorses both computer mice and computer mouses as correct plural forms for computer mouse. The form mice, however, appears most commonly, while some authors of technical documents may prefer either mouse devices or the more generic pointing devices. The plural mouses treats mouse as a "headless noun."http://en.wikipedia.org/wiki/Computer_mouse#....