noun Computers.
a touch-sensitive display screen: touching different portions of the screen with a finger will cause the computer to take actions determined by a program.
Also, touch screen.

1970–75; touch + screen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
touch screen
a.  a visual display unit screen that allows the user to give commands to the computer by touching parts of the screen instead of using the keyboard
 b.  (as modifier): a touch-screen computer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  touch screen
Part of Speech:  n
Definition:  a display or monitor on which the user selects options with the touch of a finger, stylus, or digital pen
Etymology:  1974
Usage:  touch-screen, adj's 21st Century Lexicon
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American Heritage
Science Dictionary
touchscreen   (tŭch'skrēn')  Pronunciation Key 
A monitor screen that can detect and respond to something, such as a finger or stylus, pressing on it.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

touch screen definition

An input device that allows user to interact with computer by touching the display screen.
Often this uses beams of infrared light that are projected across the screen surface. Interrupting the beams generates an electronic signal identifying the location of the screen. Software interprets the signal and performs the required operation.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
One of the closest applications with a reasonable market value was a flexible
  touch screen.
Each table has a computer with a touch screen on which you order your food,
  picking and choosing ingredients as you go.
The team started with a seven-inch, commercial, single-input touch screen.
Invite your friends over to gather around the jumbo touch screen.
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