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.
†YEST, n. Sc. variant forms of yeast (Fif. 1807 A. Williamson Poems 135; Sc. 1834 Wilson Noctes Amb. (1855) IV. 161).