American Heritage® Dictionary of the English Language, Fourth Edition
- n. See blackhead.
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. It is usually simply the retained secretion of the morbid gland, but may include, contain, or be caused by the presence of a minute acarid, Demodex folliculorum.
- n. a blackhead
GNU Webster's 1913
- n. (Med.) 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).
- n. a black-tipped plug clogging a pore of the skin
- From Latin comedō ("glutton"). (Wiktionary)
- Latin comedō, glutton (from a comparison of the worm-like shape of the waxy material that can be squeezed from a blackhead to a worm believed to feed on the body), from comedere, to eat up : com-, intensive pref.; see com- + edere, to eat. (American Heritage® Dictionary of the English Language, Fourth Edition)
“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.”
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