Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BLACK GRAIN, n.comb. Oats, as opposed to wheat.Slg. 1831 Fife Herald (11 Aug.):
Some specimens, taken at random, of the wheat and black grain, which are of the very best description.