from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small inflamed elevation of the skin that is filled with pus; a pimple.
  • n. A small swelling similar to a blister or pimple.
  • n. Something likened to an inflamed, pus-filled lesion: "a cool glimpse of green between hot pustules of sooty sprawl” ( Nicholas Proffitt).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small accumulation of pus in the epidermis or dermis.
  • n. A pimple filled with pus

from the GNU version of the Collaborative International Dictionary of English

  • n. A vesicle or an elevation of the cuticle with an inflamed base, containing pus.

from The Century Dictionary and Cyclopedia

  • n. In medicine, a small inflammatory tumor containing pus; a small pimple containing pus.
  • n. In botany, a slight elevation like a pimple or little blister.
  • n. In zoology: A small rounded elevation of surface, like a blister; a papule or pimple.
  • n. A spot of color larger than a dot, and suggestive of a blister.
  • n. One of the swellings produced in the leaves and stems of plants by Cystopus, Synchytrium, and other fungi.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a small inflamed elevation of skin containing pus; a blister filled with pus


Middle English, from Old French, from Latin pustula, blister.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin pustula ("inflamed sore, blister"). (Wiktionary)



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  • A great pustule of dread burst silently between my ears.

    - Chris Morris, Blue Jam, Series II, Episode II

    June 16, 2009

  • See also pus jewel

    December 5, 2008

  • *groan*

    November 1, 2007

  • he wanted to get his boil lanced before christmas, but the dr. insisted that he wait pustule...

    November 1, 2007