toxicity toxicemia • toxicodendrol · · · Info · Definitions · Synonyms · Characters · · toxicity · · Text Latin · · Script 8 · · Length Definitions · · · (noun) the degree to which something is poisonous. · · Noun Definition 1 (noun) grave harmfulness or deadliness. Synonyms: perniciousness. · · Noun Definition 2 Synonyms · · · perniciousness · · Synonym 1 Characters · · c latin small letter c U+0063 i latin small letter i U+0069 o latin small letter o U+006F t latin small letter t U+0074 x latin small letter x U+0078 y latin small letter y U+0079