Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
DYAN, n. “A wet, swampy piece of land, a boggy patch in a field” (Ork. 1929 Marw.; Cai.3 1950 (in place-names)). [′daiən]
[Cf. O.N. dýna, boggy ground, O.Dan. dyande, a morass.]