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archaic of or relating to yesterday: yester sun. Also: yestern
[Old English geostror; related to Old High German gestaron, Gothic gistra, Old Norse ī gǣr]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
of or pertaining to yesterday (usu. used in combination): yesternight.
[1570–80; extracted from yesterday]
a combining form occurring in words that denote a time one period prior to the present period, the nature of the period being specified by the second element of the compound: yesteryear.
(Old English geostran, c. Old High German gestre; akin to Latin hesternus of yesterday]
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