Poisonous

Part of speech: adjective

Pronunciation: /ˈpɔɪzənəs/

Definitions

1. Containing or producing substances that can cause illness, injury, or death when absorbed by living organisms
2. Containing harmful substances that may injure or kill living organisms upon ingestion, inhalation, or skin contact
3. Possessing toxic properties that can lead to severe health effects or fatalities in affected individuals through various forms of exposure

Etymology: The adjective describing something capable of causing harm or death through toxicity traces back to the noun "poison," which entered English in the late Middle Ages. Originally, "poison" derived from Old French "poison," itself stemming from the Latin "potio," meaning "a drink" or "a potion," often with medicinal or harmful properties. Over time, the term narrowed from any kind of potion or drink to specifically one that causes illness or death. The suffix "-ous," common in English adjectives, comes from Latin "-osus," meaning "full of" or "having the qualities of." When appended to the noun, it transforms the word into an adjective indicating possession of the characteristic described by the root. Thus, "poisonous" literally means "full of poison" or "having the qualities of poison." The adjective form appeared in English around the late 14th to 15th century, during a period when many Latin- and French-derived adjectives were becoming standardized. This formation allowed speakers to describe not just the substance itself but anything imbued with or capable of imparting poison—living creatures, plants, or objects. Through this linguistic evolution, the word shifted from describing a substance to an attribute, applied broadly across contexts where toxicity or danger was present. Its pronunciation, with stress on the first syllable and the characteristic "-ous" ending, has remained stable since its early usage in English.

Synonyms: toxic, venomous, harmful

Antonyms: harmless, safe