Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
FLOO, n. Also irreg. flood. The core of an animal's horn (Ork. 1929 Marw.; Ork.5 1952). [flu:, flʌd]
[Cf. Loo, Sloo, id., and Norw. dial. lo, slo, O.N. sló, id. The form may have been influenced by or confused with Norw. dial. flo, a kernel of grain, a nut, etc.]