Source : Webster's Revised Unabridged Dictionary (1913)

Parapegm \Par"a*pegm\, n. [L. parapegma, Gr. ?, fr. ? to fix
   beside; ? beside + ? to fix: cf. F. parapegme.]
   An engraved tablet, usually of brass, set up in a public
   place.

   Note: Parapegms were used for the publication of laws,
         proclamations, etc., and the recording of astronomical
         phenomena or calendar events.