Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
RO, v.2 Of a female animal, esp. a sow: to be in season (Sh. 1908 Jak. (1928)). Ppl.adj. roin, in heat.Sh. 1898 Shetland News (24 Dec.):
Ye might better meet da warst bitin' dog i' da land is a grice, especially a roin ane.