- A form of progressive pneumonia in sheep, caused by a lentivirus. See also visna.More example sentences
- Maedi and visna are slowly progressive viral diseases.
- Norwegian authorities and industries have for years used great efforts and resources to control and eradicate diseases such as bovine virus diarrhoea (BVD) in cattle, and maedi in small ruminants.
1950s: from Icelandic, literally 'shortness of breath'.