Source : Webster's Revised Unabridged Dictionary (1913)

Copts \Copts\ (k[o^]pts"), n. pl.; sing. {Copt}. [See {Coptic}.]
   (Etnol.)
   1. An Egyptian race thought to be descendants of the ancient
      Egyptians.

   2. The principal sect of Christians in Egypt and the valley
      of the Nile.

   Note: they belong to the Jacobite sect of Monophysite
         Christians, and for eleven centuries have had
         possession of the patriarchal chair of Alexandria.

Source : WordNet®

Copt
     n 1: an Egyptian descended from the ancient Egyptians
     2: a member of the Coptic Church