Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
LOO, n.1 The core or inner part of the horn of an animal (Ork. 1929 Marw., Ork. 1961). Cf. Floo, Sloo, id.
[Norw. dial. lo, id., prob. by wrong division of s- from O.N. sló, id.]