Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
HALLIOR, n. “A term applied to the moon in her last quarter, when much in the wane” (Abd. 1825 Jam.).Sc. 1815 L. Penrose Journal III. 83:
It is a saying among our people in Scotland, whenever they mistake one object for two, that the moon is in the hallior or clouded, and at such times they are winnel-skewed, or their eyes deceive them.