单词 | visna |
释义 | visna/ˈvɪznə /noun [mass noun] Veterinary Medicine A fatal disease of sheep in which there is progressive demyelination of neurons in the brain and spinal cord, caused by the maedi virus.It is a voluntary scheme with over 2800 flocks that have been blood tested and are accredited free of Maedi visna....
Origin1950s: from Old Norse, 'to wither'. |
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