'Toxicologist' definitions:

Definition of 'toxicologist'

(from WordNet)
noun
One who studies the nature and effects of poisons and their treatment

Definition of 'Toxicologist'

From: GCIDE
  • Toxicologist \Tox`i*col"o*gist\, n. One versed in toxicology; the writer of a treatise on poisons. [1913 Webster]