Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
†ARR-TREE, n.comb. The plough-beam of the single-stilted Ork. plough (Ork. 1814 J. Shirreff Agric. Ork. 51). [Ad. Norw. dial. ar(d), a plough, + Tree, n., 4.]