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.
ROO, n.2 Also wro(o) (Ayr. 1825 Jam.). An enclosure in a grass field in which cattle are penned during the night (Kcd. 1825 Jam.).
[Of obscure orig. The spelling with w is due to association with Mid.Eng. wro, a nook or corner, which is unconnected.]