Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
YAGG, n. A layer of useless stone lying above good stone in a quarry (Ork. 1929 Marw.).
[Orig. uncertain. ? A vocalised form ad. Norw. lag, a layer. Cf.Y, letter, 2. (3) (ii).]
