eyewink

noun

1. (poetic)An instant, a short moment.

   “As to age, Bead could not form any clear impression; he might have been twenty, or forty. All of this visual perception occurred in an eyewink of time […]”

   “It vanished out of sight with exceeding speed; Rapid it was; A burst of brilliance which lasted less than an eyewink.”

2. The winking of an eye.

   “Dogs were conditioned to give an eyewink to light by pairing a light and a puff of air to the cornea.”

   “Simply by observing the antecedents to the movement, we can tell, for example, whether an eyewink has occurred voluntarily […]”