WordReference Random House Unabridged Dictionary of American English © 2026
vis•na  (vis′nə),USA pronunciation n. 
  1. Veterinary Diseasesa disease of sheep, caused by a quickly mutating lentivirus, and affecting the central nervous system.
  • Old Norse visna to wither
  • 1955–60

'visna' also found in these entries (note: many are not synonyms or translations):
wizen

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