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.
DEAS, n.2 (See quot.)Slk. 1886 T. Craig-Brown Hist. Slksh. I. 34:
The singular series of terraces visible on many hill-slopes throughout the country have been held as evidence of Roman cultivation. . . . They are called deases in Scotland.