Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
UNDERPLY, n. A band or division of the upper portion of a thick seam of coal (Sc. 1883 W. S. Gresley Gl. Coal-Mining 267, Fif., Clc., Lnl., Ayr. 1973). See Ply, n., 2.
