/ Dictionary / Index Y yestreen: Meaning and Definition of Find definitions for: yes•treen Pronunciation: (ye-strēn'), [key] — Scot. and North Eng. Scot. and North Eng. —n. yesterday evening; last evening. —adv. during yesterday evening. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yesteryear yet Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language