Webster’s Revised Unabridged Dictionary · 1913
Yester
Yes′ter (yĕs′tẽr), a. [See Yesterday.] Last; last past; next before; of or pertaining to yesterday.
[An enemy] whom yester sun beheld Mustering her charms. Dryden.
☞ This word is now seldom used except in a few compounds; as, yesterday, yesternight, etc.