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.
ASTREES, n. (See below.)Ork. 1825 Jam.2:
The beam of a plough.Ork. 1929 Marw.:
I imagine, however, that the name astrees, from its plur. form, has been applied to the swingletrees for the hauling of áss, the beam of the plough.