The Collaborative International Dictionary of English v.0.48:

Spae \Spae\, v. i. [imp. & p. p. Spaed; p. pr. & vb. n.
   Spaeing.] [Scot. spae, spay, to foretell, to divine, Icel.
   sp[=a].]
   To foretell; to divine. [Scot.]
   [1913 Webster]