(idiomatic) (originally) by the authority or power of; (now) because of; on the grounds of; by reason of.

To have sexual intercourse for the first time.

(virology, pleonastic) Synonym of HIV (“human immunodeficiency virus”)

(virology) Either of the two related viruses, human immunodeficiency virus 1 (HIV-1) and human immunodeficiency virus 2 (HIV-2) that progressively destroy the body's immune system and can potentially lead to AIDS.

Timber (lumber) taken from an uncultivated forest.

Any of many viruses that possess ribonucleic acid as their genetic material and do not replicate using DNA

(advertising and marketing) A technique aiming at reproducing "word of mouth", usually on the internet or by e-mail, for humorous, political or marketing purposes.

(chiefly Britain) Alternative spelling of bovine viral diarrhea

Any of various diseases caused by a bovine viral diarrhea virus.

plural of viral