toxicant

Etymology
From, present participle of.

Adjective

 * 1) Capable of causing damage or dysfunction by toxicity;  poisonous.

Noun

 * 1) A toxic or poisonous substance.

Usage notes
A toxicant is sometimes differentiated from a in that a toxicant is any substance that is toxic (including all toxins) whereas  are only those that are naturally occurring. The biochemical relation is well exemplified by ethanol, which is both an intoxicant and a toxicant.

Synonyms

 * toxant