from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A pointing device consisting of a soft pad sensitized to finger movement or pressure and used especially on laptop computers as an alternative to a mouse.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A flat surface which is sensitive to touch, used mostly in laptop computers to control an on-screen cursor.
touch + pad (Wiktionary)