Sastra \Sas"tra\, n. Same as {Shaster}. [1913 Webster]
Shaster \Shas"ter\, Shastra \Shas"tra\, n. [Skr. c[=a]stra an order or command, a sacred book, fr. c[=a]s to order, instruct, govern. Cf. {Sastra}.] A treatise for authoritative instruction among the Hindoos; a book of institutes; especially, a treatise explaining the Vedas. [Written also {sastra}.] [1913 Webster]