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.
BACK-TREE, BAUK-TREE, n. (See quots.) [′bɑk′trei]Rxb. 1825 Jam.2:
Back-trees. The joists in a cot-house, etc.Rxb. 1923 Watson W.-B. 50:
Bauk-tree . . . Also back-tree. A joist; a tie-beam stretching from wall to wall.