Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
RUE, n.2 Sc. usage: the root of the yellow bedstraw, Galium verum, used as a dye.Sc. 1875 W. A. Smith Lewsiana 62:
The root of a small yellow plant growing in the “macher”, . . . is called rue, and is said to be a species of madder.