Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
TIRVIN, n. A lean-to or porch with sloping roof in front of an outside door (Ork. 1929 Marw.). [′tɪrvin]
[Poss. an extended usage from Tirve, v., 2., tirvin, sc. a porch covered with turf.]
