Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BLAKWAK, n. “The bittern” (Sc. 1911 S.D.D.), Botaurus stellaris.
[Name perhaps derived from the bird's raucous call (Fif.1 1934).]