Nonpathogenic

Part of speech: adjective

Definitions

1. Describing microorganisms that do not lead to illness in hosts
2. Referring to species that are incapable of causing disease and are generally safe for health
3. Characterizing microorganisms that do not produce harmful effects or infections in hosts

Etymology: "Nonpathogenic" is a plain compound: the prefix "non-", meaning "not", attached to "pathogenic," which describes something capable of producing disease. "Pathogenic" itself is built from the Greek "pathos," meaning suffering or disease, and "-genic," meaning producing or giving rise to, so the whole word literally means "not producing disease." The pattern is typical of modern scientific vocabulary, where English speakers take a classical root and attach a negating prefix to form a precise technical term. Its usefulness lies in its exactness: microbiologists and clinicians use it to separate harmless organisms from disease-causing ones, which is why it appears so often in discussions of bacteria living on the skin or in the gut.

Synonyms: harmless, safe, benign, innocuous, non-toxic

Antonyms: pathogenic, harmful, dangerous, toxic, malignant