What does poisonousness mean?
Poisonousness is the noun meaning the quality or condition of being poisonous. It describes the capacity of a substance, organism, or other thing to cause serious harm or death, and may also refer to the degree of that capacity. The word is especially common in scientific, medical, environmental, and safety-related contexts, where measurements of toxicity or the poisonousness of a material may be discussed. In ordinary writing, the adjective “poisonous” is usually more natural: one can describe a plant as poisonous or refer to the poisonousness of a chemical. Although “poisonousness” can sound abstract or technical, it is useful when the focus is on a quality as a subject of study or discussion.
nounThe quality or condition of being poisonous, especially the capacity to cause harm or death through a toxic substance.
- The quality or condition of being poisonous.
- The degree to which a substance, organism, or other thing is poisonous.
"The report examined the poisonousness of the algae in the lake and warned visitors not to swim there."
"The poisonousness of the mushrooms was difficult to determine from appearance alone."
"Researchers studied the poisonousness of several industrial chemicals before establishing safe handling procedures."
Rare; the noun is normally uncountable and has no regularly used plural.
"The study compared the poisonousnesses of different fungal species."
The word poison comes through Old French from Latin, and its history recalls the ancient idea of poison as a lethal drink.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does poisonousness come from?
“Poisonousness” is formed from “poison” plus the suffix “-ous” and the noun-forming ending “-ness.” “Poison” entered Middle English from Old French poison, ultimately from Latin, with related forms including “toxic,” “toxin,” and “toxicity.” The family reflects the shared sense of a substance that causes poisoning or harmful effects.
Related word forms
How poisonousness is actually used
Usually an uncountable noun in modern English, especially in the pattern “the poisonousness of.” The adjective “poisonous” is much more common in general writing.
Easily confused with poisonousness
Toxicity usually refers to a measurable degree of harmful effect, especially in scientific or medical contexts, whereas poisonousness more generally means the quality of being poisonous.
Poisonous is the adjective describing something capable of causing harm, while poisonousness is the noun naming that quality.