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.
THICKENIN(G), vbl.n. Also thicknen. An agent which curdles milk, rennet (wm.Sc. 1972). Comb. thickening-grass, butterwort, Pinguicula vulgaris, from its curdling properties (Ayr. 1886 B. and H. 229).Arg. 1930:
Ye've put ower little thicknen in the cruds the day, Mary; they're no right set.
