ves•i•cantPronunciation: (ves'i-kunt), [key]
producing a blister or blisters, as a medicinal substance; vesicating.
a vesicant agent or substance.
(in chemical warfare) a chemical agent that causes burns and destruction of tissue both internally and externally.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.