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.
RAG, n.5 The top layer of stones on a dyke, forming the coping (Ork. 1929 Marw., Ork. 1967).
[From Rag, n.1, from its ragged or jagged appearance.]