Synonyms: toxicant, poison, poisonous substance
Definition: any substance that causes injury or illness or death of a living organism
Similar words: substance
Definition: a particular kind or species of matter with uniform properties
Usage: shigella is one of the most toxic substances known to man
Definition: having the qualities or effects of a poison
Similar words: toxic
Definition: of or relating to or caused by a toxin or poison
Usage: suffering from exposure to toxic substances