Etymology · Proto-Indo-European
*wisós
3 English words descend from Proto-Indo-European *wisós, most common first.
- virusA submicroscopic, non-cellular structure that consists of a core of DNA or RNA surrounded by a protein coat, that requires a living host cell to replicate, and that sometimes causes disease in the host organism (such agents are often classed as nonliving infectious particles and less often as microorganisms).
- virulentOf animals, plants, or substances: extremely venomous or poisonous.
- viridGreen, verdant.