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.
ROY, n.2 Milk hardened in the udder of a newly-calved cow (Cai. 1921 T.S.D.C. 35, Cai. 1968), as a symptom of mastitis.
[Ad. Gael. rua(i)dhe, redness, inflammation, mastitis in cows. Cf. Roy, n.1]