The Collaborative International Dictionary of English v.0.48:

Parashah \Par"a*shah\, n.; pl. -shothor -shioth. [Heb.
   p[=a]r[=a]sh[=a]h.]
   A lesson from the Torah, or Law, from which at least one
   section is read in the Jewish synagogue on every Sabbath and
   festival.
   [Webster 1913 Suppl.]