[pik-suhl, -sel]
noun Computers, Television.
the smallest element of an image that can be individually processed in a video display system.

1965–70; pix2 (def 1) + el(ement)

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World English Dictionary
pixel (ˈpɪksəl)
any of a number of very small picture elements that make up a picture, as on a visual display unit
[C20: from pix pictures + el(ement)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1969, coined to describe the photographic elements of a television image, from pix (1932 abbreviation of pictures, coined by "Variety" headline writers) + el(ement).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pixel pix·el (pĭk'səl, -sěl')
The smallest image-forming unit of a video display.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pixel   (pĭk'səl)  Pronunciation Key 

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The most basic unit of an image displayed on a computer or television screen or on a printer. Pixels are generally arranged in rows and columns; a given combination among the pixels of various brightness and color values forms an image. ◇ A subpixel is one of three components of a pixel used in the representation of a color image. Each subpixel represents the contribution of a single color—red, green, or blue—to the overall color and brightness of the pixel.

Our Living Language  : The images on a computer screen are composed of tiny dots called pixels (short for picture element). The computer controls each pixel individually. Most monitors have hundreds of thousands, or often millions, of pixels that are lit or dimmed to create an image. Each pixel of a color screen is made out of one red, one blue, and one green subpixel, generally arranged in a triangle, adjusted individually to create the combined effect of a single color but treated as a unit pixel for determining resolution. Pixels vary in size according to the size and resolution of the monitor. Smaller pixels provide higher resolution, and therefore sharper images, but require more memory to store the color and intensity data of each pixel and more processing time to refresh the screen. Resolution is frequently referred to in terms of dpi, or dots per inch.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

pixel definition

picture element

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
picture element
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Digital camera makers have been working overtime to pack more pixel power into
  smaller packages.
Computer screens also have pixel issues in displaying the serifs cleanly.
Pixel are the dots that make up the picture on a display screen.
Apple's leader had an understanding of design that he applied to its products,
  down to the last pixel.
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