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.
BUTTERING-GIRSE, n.comb. Sheep's fescue, Festuca ovina (Sh. 1956 U. Venables Life in Shetland 72), prob. so called from its supposed efficiency in curdling milk.
