pixel

Short definition from Wiktionary

Noun

1. 1
   One of the tiny dots that make up the representation of an image in a computer's memory.
2. 2
   One of the squares that make up a work of pixel art or a zoomed-in image in a computer.
3. 3
   A unit of measure used in screen displays, resolutions, and similar visual media that represents either linear measure or area.

Verb

1. 1
   To create computer graphics by editing individual pixels.