'Toxicity' definitions:

Definition of 'toxicity'

(from WordNet)
noun
The degree to which something is poisonous
noun
Grave harmfulness or deadliness [syn: perniciousness, toxicity]

Definition of 'Toxicity'

From: GCIDE
  • Toxicity \Tox*ic"i*ty\, n. The quality or state of being toxic or poisonous; poisonousness. [Webster 1913 Suppl.]