| comedo | <pathology> A plug of keratin and sebum within the dilated orifice of a hair follicle, frequently containing the bacteria Propionibacterium acnes, Staphylococcus albus and Pityrosporon ovale, also called blackhead. See: acne. (18 Nov 1997) |
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| comedocarcinoma | <tumour> Form of carcinoma of the breast or other organ in which plugs of necrotic malignant cells may be expressed from the ducts. (05 Mar 2000) |
| comedogenic | Tending to promote the formation of comedones. Synonym: acnegenic. Origin: comedo + G. Genesis, production (05 Mar 2000) |
| comedonecrosis | A type of necrosis occurring with glands in which there is central luminal inflam-mation with devitalised cells, usually occurring in the breast in intraductal carcinoma. Origin: comedo + necrosis (05 Mar 2000) |
| comes | A blood vessel accompanying another vessel or a nerve; the veins accompanying an artery, often two in number, are called venae comitantes or venae comites. Origin: L. A companion, fr. Com-, together, + eo, pp. Itus, to go (05 Mar 2000) |
| comet sign | In chest radiology, the curved appearance of pulmonary arteries and veins associated with round atelectasis, fibrosis associated with organizing pleurisy. Synonym: comet tail sign. (05 Mar 2000) |
| comet tail sign | In chest radiology, the curved appearance of pulmonary arteries and veins associated with round atelectasis, fibrosis associated with organizing pleurisy. Synonym: comet tail sign. (05 Mar 2000) |
| cometabolism | <biochemistry> The metabolic transformation of a substance while a second substance serves as primary energy or carbon source. (09 Oct 1997) |