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English word poisonous comes from English poison, English -ous.

Poisonous etymology ?

Poisonous detailed word origin explanation

Dictionary entryLanguageDefinition
poison English (eng) (transitive) To cause someone to hate or to have unfair negative opinions. (transitive) To cause something to become much worse. (transitive) To pollute; to cause some part of the environment to become poisonous. (transitive) To use poison to kill or paralyse somebody (informal) A drink; liquor.. A substance that is harmful or lethal to a living organism.. Something that harms a person or thing.
-ous English (eng) (chemistry) Used in chemical nomenclature to name chemical compounds in which a specified chemical element has a lower oxidation number than in the equivalent compound whose name ends in the suffix -ic. For example sulphuric acid (H2SO4) has more oxygen atoms per molecule than sulphurous acid (H2SO3). See Inorganic nomenclature.. Used to form adjectives from nouns, to denote possession or [...]
poisonous English (eng) (of an animal) Inedible due to containing poison; poisonous to eat. Containing sufficient poison to be dangerous.

Words with the same origin as poisonous

Descendants of -ous
analogy courageous delirious gorge gorgeous murderous nauseous outrageous spontaneous