poisonous.
Containing sufficient poison to be dangerous to touch or ingest.
Meaning & usage
Containing sufficient poison to be dangerous to touch or ingest.
While highly poisonous to dogs, this substance is completely harmless if ingested by humans.
Of an animal such as a snake or spider, or parts of its body: producing a toxin intended for defensive or offensive use which is usually injected into an enemy or prey by biting or stinging; hence, of a bite or sting: injecting poison.
Poisonous snakes should only be handled by experienced professionals.
Negative, harmful.
Where this word comes from
From Middle English poisounous, poysonouse. By surface analysis, poison + -ous.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.