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vesicant vs. irritant

vesicant
[ves-i-kuhnt] / ˈvɛs ɪ kənt /

adjective

  1. producing a blister or blisters, as a medicinal substance; vesicating.

noun

  1. a vesicant agent or substance.

  2. (in chemical warfare) a chemical agent that causes burns and destruction of tissue both internally and externally.

irritant
[ir-i-tnt] / ˈɪr ɪ tnt /

adjective

  1. tending to cause irritation; irritating. irritating.

noun

  1. anything that irritates.

  2. Physiology, Pathology. a biological, chemical, or physical agent that stimulates a characteristic function or elicits a response, especially an inflammatory response.