The Collaborative International Dictionary of English v.0.48:

Sain \Sain\, obs. p. p. of Say, for sayen.
   Said. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sain \Sain\, v. t. [Cf. Saint, Sane.]
   To sanctify; to bless so as to protect from evil influence.
   [R.] --Sir W. Scott.
   [1913 Webster]