Main Entry: ¹blis·ter

Pronunciation: \ˈblis-tər\

Function: noun

Etymology: Middle English blister, blester, probably from Old English *blýster, *blǣster; akin to Old Norse blāstr swelling, Old English blǣst blast

Date: 14th century

1 : an elevation of the epidermis containing watery liquid
2 : an enclosed raised spot (as in paint) resembling a blister
3 : an agent (as lewisite) that causes blistering
4 : a fungal disease of plants marked by raised patches on the leaves
5 : any of various structures that bulge out (as a gunner's compartment on a bomber)

— blis·tery \-t(ə-)rē\ adjective