The Collaborative International Dictionary of English v.0.48:

Picts \Picts\, n. pl.; sing. Pict. [L. Picti; cf. AS.
   Peohtas.] (Ethnol.)
   A race of people of uncertain origin, who inhabited Scotland
   in early times.
   [1913 Webster]

The Free On-line Dictionary of Computing (30 December 2018):

PICT

    An Apple graphics format.

   [Details?]

   (1997-06-06)