from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See blackhead.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a blackhead
from the GNU version of the Collaborative International Dictionary of English
- n. A small nodule or cystic tumor, common on the nose, etc., which on pressure allows the escape of a yellow wormlike mass of retained oily secretion, with a black head (dirt).
from The Century Dictionary and Cyclopedia
- n. A small, worm-like, black-tipped mass, such as may sometimes be squeezed out of the sebaceous follicles of the face.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a black-tipped plug clogging a pore of the skin
Need I remind you, sir, who it was that single-handedly captured—alive, I might add—the only specimen of Malus cerebrum comedo in the history of monstrumology?
This longish-short comedo-tragic bit just about covers everything.
*  Quoties diem ilium considero, toto corpore contremisco, sive enim comedo, sive bibo, sive aliquid aliud facio, semper videtur illa tuba terribilis sonare in auribus meis, Surgite, mortui, venite ad judicum.
The black specks soon began to project, and comedo-like plugs and small, spine-like growths were produced.
#Is there any difficulty in the diagnosis of comedo?
(_Synonyms: _ Blackheads; Flesh-worms.) #What is comedo?
Not if it be remembered that acne eruption is limited to certain parts and is always follicular, and that the several stages, from the comedo to the matured lesion, are usually to be seen in the individual case.
On the upper trunk so-called double and multiple comedo have been noted -- the two, three, or even four closely-contiguous blackheads are, beneath the surface, intercommunicable, the dividing duct-walls having apparently disappeared by fusion.
The excess sebum combines with the dead cells and forms a plug, or comedo (also called comedones), that blocks the pore, which is not usually seen.
The difference between them is that a blackhead, or open comedo, is open at the surface of the skin.