blister

Short definition from Wiktionary

Noun

1. 1
   A small bubble between the layers of the skin that contains watery or bloody fluid and is caused by friction and pressure, burning, freezing, chemical irritation, disease, or infection.
2. 2
   A swelling on a plant.
3. 3
   Something applied to the skin to raise a blister; a vesicatory or other applied medicine.
4. 4
   A bubble, as on a painted surface.
5. 5
   An enclosed pocket of air, which may be mixed with water or solvent vapor, trapped between impermeable layers of felt or between the membrane and substrate.
6. 6
   A type of pre-formed packaging made from plastic that contains cavities.
7. 7
   A cause of annoyance.
8. 8
   A form of smelted copper with a blistered surface.

Verb

1. 1
   To raise blisters on.
2. 2
   To sear after blaching.
3. 3
   To have a blister form.
4. 4
   To criticise severely.
5. 5
   To break out in blisters.