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, n.3 Clay, mud, mire (Sh. 1908 Jak. (1928); I.Sc. 1962); specif. a fine bluish or whitish clay (Ork. 1929 Marw.). Combs. mar-clay, id. (Jak.); mar-pow, a pool where this clay is to be found (Ork.5 1962).
[Cf. Faer. mar(ra), mud, mire, Dan. dial. mare, bog, Swed. dial. mar, morass, cogn. with Mar, n.2]