poisonous substance poisonous plant • poison parsley · · · Info · Definitions · Synonyms · Characters · · poisonous substance · · Text Common · · Latin · · Scripts 19 · · Length 5 · · Syllables Definitions · · · (noun) any substance that causes injury or illness or death of a living organism. Synonyms: poison, toxicant, poisonous substance. · · Noun Definition 1 Synonyms · · · poison · · Synonym 1 toxicant · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075