[ vis-nuh ]
/ ˈvɪs nə /


Veterinary Pathology. a disease of sheep, caused by a quickly mutating lentivirus, and affecting the central nervous system.

Origin of visna

First recorded in 1955–60, visna is from the Old Norse word visna to wither Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019