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loup·ing ill | \ ˈlau̇-piŋ- 
, ˈlō- \
, ˈlō- \Medical Definition of louping ill
: a variable tick-borne viral disease that occurs especially in sheep and other domestic animals and sporadically in humans, that primarily affects the central nervous system, and is caused by a flavivirus (species Louping ill virus of the genus Flavivirus)
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