(Translated by https://www.hiragana.jp/)
Online Etymology Dictionary
The Wayback Machine - https://web.archive.org/web/20101230213602/http://www.etymonline.com:80/index.php?search=pixel
pixel Look up pixel at Dictionary.com
1969, coined to describe the photographic elements of a television image, from pix + el(ement).
megapixel Look up megapixel at Dictionary.com
by 1977, from mega- + pixel.