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.
BEIN, adj. Water-tight. Cf. Beam, v.1, Beam, v.2Lnk. 1825 Jam.2 s.v. bene:
A bein cask is one that is perfectly water-tight.