Etymology
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pixel (n.)

"small, square single-colored display elements that comprise an image," 1969, coined to describe the photographic elements of a television image, from pix + first syllable of element.

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Definitions of pixel

pixel (n.)
(computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot);
the greater the number of pixels per inch the greater the resolution
Synonyms: pel / picture element
From wordnet.princeton.edu