espial

noun3

1. •
   An act of noticing or observing.

   • Secure—unnoted—Conrad's prow pass'd by, / And anchor'd where his ambush meant to lie; / Screen'd from espial by the jutting cape, / That rears on high its rude fantastic shape. — 1814
2. •
   The fact of noticing or observing; a discovery.
3. •
   (no longer used) A scout; a spy.