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.
WAAL, n. The wake made by an oar in the water (Cai. 1971).
[Prob. a specialised usage of Wall, well, from the bubbling up of the water. Cf. Sh. Norn vill, id., from Norw. vell, a well.]
