Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
WUGRUM, n. Also wowgrum. A black mouldy stain running down an inner wall caused by roof leakage (Cai. 1905 E.D.D., Cai. 1974). [′wʌ(u)grʌm]
[Ad. Norw. dial. veggjerune, Icel. veggruni, id., lit. “wall-run”.]