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.
AR-TREE, n. (See quots.)1. Sh. 1908 Jak. (1928):
Plough-beam; long bar; the foremost part of a plough.
2.Ib.:
A piece of wood which is nailed down on the fore-end of the plough-beam, and to which the traces are fastened.