Wordnet 3.0
NOUN (1)
1. 
 (computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot); 
- Example: "the greater the number of pixels per inch the greater the resolution"[syn: pixel, pel, picture element]
WordNet (r) 3.0 (2006):
pel
    n 1: (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" [syn: pixel, pel, picture element]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
PEL
       Picture ELement