Medical Definition of SIV
: a retrovirus of the genus Lentivirus (species Simian immunodeficiency virus) that causes a disease in monkeys similar to AIDS and that is closely related to HIV-2 of humans—called also
Learn More about siv
Dictionary: Definition of "SIV"
Seen and Heard
What made you want to look up SIV? Please tell us where you read or heard it (including the quote, if possible).