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From The Collaborative International Dictionary of English v.0.48:
Yester \Yes"ter\, a. [See Yesterday.] Last; last past; next before; of or pertaining to yesterday. [1913 Webster] [An enemy] whom yester sun beheld Mustering her charms. --Dryden. [1913 Webster] Note: This word is now seldom used except in a few compounds; as, yesterday, yesternight, etc. [1913 Webster]