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).
このキノコは有毒なので食べられません。
This mushroom is poisonous, so you can't eat it.
有毒ガスが発
Toxic gas has been released, so please evacuate.