Meaning and usage guide
poisonous vs venomous
Meaning, usage, and examples
A poisonous organism or substance harms when it is eaten, inhaled, absorbed, or touched. A venomous animal actively delivers venom through a bite or sting.
How to choose
Follow the route of the toxin
The crucial question is whether the harmful substance is passively encountered or actively delivered.
Eaten, inhaled, or absorbed: poisonous
Use poisonous when contact or consumption exposes someone to a harmful toxin.
Some wild mushrooms are poisonous if eaten.
Injected by bite or sting: venomous
Use venomous for an animal that delivers venom through a specialized structure.
The region is home to several venomous snakes.
Direct answer
What is the difference?
Use poisonous for toxins that cause harm through ingestion, inhalation, absorption, or contact. Use venomous for animals equipped to inject venom through fangs, spines, stingers, or similar structures. Everyday speech sometimes calls venomous snakes poisonous, but the delivery distinction is useful in biology and safety communication.
Optional listening · American English
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Word 1
poisonous
adjective
Containing or producing poison that harms through contact or exposure.
US pronunciation
/ˈpɔɪzənəs/
UK IPA
/ˈpɔɪzənəs/
Hear three samples
How to pronounce it
Stress POY, use a voiced Z, and keep the final two syllables light rather than stressing “onus.”
Word 2
venomous
adjective
Capable of delivering venom through a bite, sting, spine, or similar structure.
US pronunciation
/ˈvɛnəməs/
UK IPA
/ˈvenəməs/
Hear three samples
How to pronounce it
Stress VEN, voice the opening V clearly, and reduce both remaining vowels to light “uh” sounds.
Listen in context
6 example sentences
Context makes meaning, grammar, and natural rhythm easier to understand. Every sentence has its own playback.
Examples with
poisonous
- The guide warns hikers about poisonous plants.
- Smoke from the fire released poisonous gases.
- That brightly colored frog is poisonous.
Examples with
venomous
- A venomous spider bit the gardener.
- Not every snake in the area is venomous.
- The aquarium keeps venomous fish in a secure tank.
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