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.
¶TOOR, adj. Tedious, wearisome, difficult (Ayr. 1880 Jam.).
[Hardly a descendant of Mid.Eng. toor, tor, id. Jam. suggests a corruption of Dour, but the word may not be authentic.]