Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
¶MAR-TAIL, n.comb. Nonce variant of mare(s) tail, applied erron. to the cornfield horsetail, Equisetum arvensis (Ayr. 1811 W. Aiton Agric. Ayr. 675).