Learn how to say Poisonousness correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word poisonous:
(of a substance or plant) causing or capable of causing death or illness if taken into the body:
(of an animal) producing poison as a means of attacking enemies or prey; venomous:
a poisonous snake
extremely unpleasant or malicious:
there was a poisonous atmosphere at the office
Poisonous and venomous are not identical in meaning, although they are often used interchangeably. A poisonous animal or plant produces toxins that are harmful when the animal or plant is touched or eaten, whereas a venomous snake or other creature is able to inject venom by means of its fangs, spines, or stingers.