A larval stage of certain tapeworms that forms a cyst containing multiple tapeworm heads (scolices) in a single fluid-filled cavity.
From Greek koinós (common) + oúrā (tail), literally meaning 'common tail,' named because multiple heads share one body cavity.
Coenurus infection in sheep's brains caused 'gid disease,' which made infected animals stagger in circles—historical farmers called it 'turnsickness,' and it was one of the first diseases linked to parasites under the microscope.
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