SIV

noun
\ˌes-ˌī-ˈvē \

Definition of SIV 

: a lentivirus (species Simian immunodeficiency virus) that causes a disease in monkeys similar to AIDS and that is closely related to HIV-2

First Known Use of SIV

1987, in the meaning defined above

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The first known use of SIV was in 1987

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SIV

noun
\ˌes-ˌī-ˈvē \

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 simian immunodeficiency virus

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