Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BUBBLE-WUD, n.
1. “Wood of the elder-tree” (Rxb. 1923 Watson W.-B.).
2. With trei or buss, “the elder-tree” (Ib.).
[According to Watson the wood when chewed forms bubbles in the mouth.]