/ves"i keuhnt/ , adj.
1. producing a blister or blisters, as a medicinal substance; vesicating.
n.
2. a vesicant agent or substance.
3. (in chemical warfare) a chemical agent that causes burns and destruction of tissue both internally and externally.
[ 1655-65; vesicant- (s. of vesicans ), prp. of vesicare to VESICATE; see -ANT ]