Definition of "yestreen"

yestreen

noun
plural yestreens
1. (chiefly archaic, poetic or Scotland) The night before.
  Quotations
  It was the creature Dougal that extricated me, as he did yestreen […] .
  1817 December 31 (indicated as 1818), [Walter Scott], chapter IV, in Rob Roy. […], volume III, Edinburgh: […] James Ballantyne and Co. for Archibald Constable and Co. […]; London: Longman, Hurst, Rees, Orme, and Brown, page 95
  "Well, it's a funny thing, but I can't get rid of the impression that at some point in my researches into the night life of London yestreen I fell upon some person to whom I had never been introduced and committed mayhem upon his person."
  1917, Pelham Grenville Wodehouse, chapter IV, in Piccadilly Jim‎, New York: Dodd, Mead and Company
  You have not forgotten our telephone conversation of yestreen, Jeeves?
  1960, P[elham] G[renville] Wodehouse, chapter XI, in Jeeves in the Offing, London: Herbert Jenkins