Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
‡BALL CLAY, n. Very adhesive clay.Ayr. 1811 W. Aiton Gen. View of Agric. of Ayr 27:
If steril and adhesive, it is sometimes termed strong or ball clay.