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loup·ing ill(lou′pĭng, lō′-)
An infectious neurological disease chiefly of sheep, caused by a flavivirus that is transmitted by the sheep tick. It is characterized by a jerky, hopping gait and often prolonged trembling.
[From Scots loup, to leap, from Middle English lopen; see lope.]
louping ill(ˈlaʊpɪŋ; ˈləʊ-)
(Veterinary Science) a viral disease of sheep causing muscular twitching and partial paralysis: transmitted by the bite of an infected tick (Ixodes ricinus)
[C18 louping, from loup2]