Source : Webster's Revised Unabridged Dictionary (1913)

Sain \Sain\, obs. p. p. of {Say}, for sayen.
   Said. --Shak.

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