Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
SLAAK, n. The core or quick of an animal's horn. Cf Slo, Sloch, n.3 Gael.Per. 1724 W. Macfarlane Geog. Coll. (S.H.S.) I. 342:
A bone of great length appearing to be the slaak of a horn.