Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BIRK, n.2 “A species of aquatic plant, belonging to the willow family, also called “widi” and “water-willow” (Sh. 1908 Jak. (1928)).
[This meaning is not known to Sh.7 and the origin is uncertain.]
