na-adjective, noun which may take the genitive case particle 'no', noun
Describes substances, gases, or organisms that are harmful or lethal when ingested, inhaled, or touched. Used both as a noun and adjectivally (な or の).
This mushroom is poisonous, so you can't eat it.
Toxic gas has been released, so please evacuate.
This mushroom is poisonous.
Toxic substances leaked out from the factory.
Toxic gas was released at that construction site.
poisonous substance; toxic substance