Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BOULACH, n. “The common name in Gall. for ragwort (Senecio jacobæa). It seems to represent obsolete Gaelic buidhlach, the name for this yellow weed in mod. Gaelic being bua(dh)ghallan” (Gall.1 1933).
[Gael. buidhe, yellow, O.I. buide; cogn. Eng. bay (MacLennan).]