Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BOAR'S HEAD, n.phr. See quot.:Sc. 1863 Edb. New Philosoph. Jnl. XVIII. 224:
The fragment of a rainbow in the north, which is called the “Boar's Head”, makes the boatmen keep a look-out for wind.
