Webster's English Dictionary

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blister

1. blis.ter \'blis-t*r\ \-t(*-)re-\ n [ME, modif. of OF or MD; OF blostre 
   boil, fr. MD bluyster blister;]akin to OE bl-st blast 1: an elevation 
   of the epidermis containing watery liquid  2: an enclosed raised spot (as 
   in paint) resembling a blister  3: an agent that causes blistering  4: a 
   disease of plants marked by large swollen patches on the leaves  5: any of 
   various structures that bulge out (as a gunner's compartment on a n 
   airplane) - blis.tery aj
2. blister \-t(*-)rin\ vb or blis.ter.ing : to become affected with a 
   blister  1: to raise a blister on  2a: to administer severe physical 
   punishment to esp. by whipping  2b: to scorch with words