Source : Webster's Revised Unabridged Dictionary (1913)

Espial \Es*pi"al\, n. [OE. & Norm. F. espiaille. See {Espy}.]
   1. The act of espying; notice; discovery.

            Screened from espial by the jutting cape. --Byron.

   2. One who espies; a spy; a scout. [Obs.] ``Their espials . .
      . brought word.'' --Holland.

Source : WordNet®

espial
     n : the act of detecting something; catching sight of something
         [syn: {detection}, {catching}, {spying}, {spotting}]