TOXIC

toxic

(adjective) of or relating to or caused by a toxin or poison; “suffering from exposure to toxic substances”

Source: WordNet® 3.1

Etymology

Adjective

toxic (comparative more toxic, superlative most toxic)

(toxicology, pharmaceutical drug) Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities.

Synonyms: poisonous, venomous

(medicine) Appearing grossly unwell; characterised by serious, potentially life-threatening compromise in the respiratory, circulatory or other body systems.

(figurative) Severely negative or harmful.

(figurative, of a person) Hateful or strongly antipathetic.

Source: Wiktionary

Tox"ic, Tox"ic*al, a. Etym: [L. toxicum poison, originally, a poison in which arrows were dipped, Gr. Intoxicate.]

Definition: Of or pertaining to poison; poisonous; as, toxic medicines.

Source: Webster’s Unabridged Dictionary 1913 Edition