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.
RONNACH, n. In pl.: couch grass, Agropyron repens (Abd., Kcd. 1808 Jam.; Kcd. 1968).
[Orig. uncertain. Appar. a dissimilated form of Lonnach, id., q.v. Cf. also Rammock, n.2]