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1. a comedo whose opening is not widely dilated, appearing as a small, flesh-colored papule; because the keratin and sebum produced cannot escape, it may rupture and cause an inflammatory lesion in the dermis. See also acne vulgaris. Called also closed comedo.
2. popular name for milium.


Walter, English surgeon, 1840-1913. See: Whitehead deformity, Whitehead operation.


(wīt′hĕd′, hwīt′-)
1. A skin lesion consisting of a hair follicle that is occluded with sebum and keratin, appearing white at the surface.
2. See milium.


(1) Closed comedo.
(2) Milia, see there.


, pl. milia (mil'ē-ŭm, -ă)
A small subepidermal keratin cyst, usually multiple and therefore commonly referred to in the plural.
Synonym(s): whitehead (1) .
[L. millet]

closed co·me·do

(klōzd kom'ĕ-dō)
A comedo with a narrow or obstructed opening on the skin surface; closed comedos may rupture, producing a low-grade dermal inflammatory reaction.
Synonym(s): whitehead (2) .
References in periodicals archive ?
(31) Alfred North Whitehead, Process and Reality: Corrected Edition, eds.
'The art of progress is to preserve order amid change and to preserve change amid order.' This saying, by British philosopher Alfred North Whitehead, is one of my favorite quotes.
Alfred North Whitehead (1929) called such mindless trivia "inert information" and said it neglects an education built on romance, precision, and generalization.
But more narrowly and conventionally speaking, process thought is the school of Alfred North Whitehead and Charles Hartshorne.
The book is an interpretation of Alfred North Whitehead's philosophy.
As Alfred North Whitehead told us, nature (the cosmos) is "alive" It may expand, contract, or reach a temporary equilibrium.
More common are the "novel-like" proofs, such as the one occupying several hundred pages in Bertrand Russell and Alfred North Whitehead's Principia Mathematica (1910-13) showing that 2+2=4.
Alfred North Whitehead, in a series of lectures published as Process and Reality (1978) describes his 'philosophy of organism'.
In the 1920s, British mathematician and educator Alfred North Whitehead wrote an essay titled "The Rhythm of Education," in which he discussed the progression of a student in a formal learning situation.
In the spirit of Alfred North Whitehead, we are invited by the contributing authors to approach our current beliefs as if they only contain half of the truths we need in order to understand the questions we analyze (Hare 2000, 4).
Indeed, Alfred North Whitehead proclaimed that Christian theology holds the only metaphysical innovation since Plato.