A blister is a fluid-filled bubble people get where something rubs or burns the skin. Common causes are wearing fancy new shoes, playing sports, and trying to cook bananas flambé. Having a blister is no fun.

A blister is a round raised area caused by repeated friction or rubbing. A second-degree burn can also cause a blister. A blister isn’t always a human problem. Plants can get blisters, and sometimes air bubbles on the surface of a painted wall or a shellacked table are called blisters. The verb blister means to form a blister. The Old French root word is blestre, "lump or bump."

Definitions of blister
  1. noun
    (pathology) an elevation of the skin filled with serous fluid
    synonyms: bleb, bulla
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    water blister
    blister containing a nonpurulent clear watery content
    blood blister
    blister containing blood or bloody serum usually caused by an injury
    a small inflamed elevation of skin containing pus; a blister filled with pus
    a pustule in an eruptive disease
    type of:
    cyst, vesicle
    a small anatomically normal sac or bladderlike structure (especially one containing fluid)
  2. noun
    (botany) a swelling on a plant similar to that on the skin
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    type of:
    enation, plant process
    a natural projection or outgrowth from a plant body or organ
  3. noun
    a flaw on a surface resulting when an applied substance does not adhere (as an air bubble in a coat of paint)
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    type of:
    defect, fault, flaw
    an imperfection in an object or machine
  4. verb
    cause blisters to form on
    “the tight shoes and perspiration blistered her feet”
    get blistered
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    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  5. verb
    get blistered
    “Her feet blistered during the long hike”
    synonyms: vesicate
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    type of:
    intumesce, swell, swell up, tumefy, tumesce
    expand abnormally
  6. verb
    subject to harsh criticism
    “The Senator blistered the administration in his speech on Friday”
    synonyms: scald, whip
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    type of:
    assail, assault, attack, lash out, round, snipe
    attack in speech or writing
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