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.
CASTING-STONE, n. comb. "The stone attached to the 'set' line in a river, by means of which the line is cast into the stream" (Bch. 1905 E.D.D. Suppl., Abd.22 1938).