Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
ORF, n. A skin-disease in sheep or in shepherds who contract the disease, contagious pustular dermatitis (ne.Sc. 1964).e.Lth. 1907 Trans. Highl. Soc. XIX. 149:
A lot of lambs will arrive home from the market with a few of them showing symptoms of what is locally known as “orf”. This is a disease of the skin showing raw blotches, chiefly affecting the feet about the coronet of the hoof, also the legs.