Nonvirulent

Part of speech: adjective

Definitions

1. Not possessing the ability to cause serious illness or damage to a host organism due to insufficient pathogenic traits or mechanisms
2. Lacking the capacity to cause significant disease or harm, this term describes organisms that do not have effective virulence factors or the capability to damage host tissues
3. Refers to an organism or agent that does not have the power to produce illness or harm in a host

Etymology: Virulent comes from Latin "virulentus", meaning "full of poison" or "poisonous", built on "virus", which in Latin meant a slimy liquid or poison. The English adjective "virulent" is an older word than the modern medical sense, first used of poisons and then of diseases and hostile speech. Adding the prefix "non-", meaning "not", produces "nonvirulent", the negative of that poison-based sense. The prefix does the work here. English has long used "non-" as a freely attached negator, so writers could form "nonvirulent" from any adjective without needing a separate coinage for each. Its ancestry runs back through Old English "nān", meaning "not one" or "none", which is the same root that gives "none" and "no".

Synonyms: nonpathogenic, harmless, benign, innocuous, safe

Antonyms: virulent, infectious, malignant, dangerous, harmful