Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI). Includes material from the 1976 supplement.
This entry has not been updated since then but may contain minor corrections and revisions.
†NULLS, n.pl. A kind of game (Sh. 1866 Edm. Gl.), not further described. Edm. associates with Null, and the game may possibly be some form of noughts and crosses. It is however possible that the word is a corruption of Knurl, n., 3. and refers to the game there described.