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.
BOSSIN, n. “An opening in a stack for ventilation” (Slg.3 1912; Arg.1 1933). Cf. Boss, n.1Lnk. 1825 Jam.2:
Bossins. Apertures left in ricks, for the admission of air, to preserve the grain from being heated.