(Phl.) a festival honoring the yazad Mihr, celebrated on the 16th day of the seventh month. (Var Mehragan, Mehregan, MEHREG?N).
Found on
http://www.avesta.org/zglos.html

(from the article `Iran, ancient`) ...as late as the reign of Yazdegerd I (399–420). On the days of the important festivals, such as Ngrz (Nrz), the first day of the vernal equinox, ...
Found on
http://www.britannica.com/eb/a-z/m/89
No exact match found.