| Comby's sign | <clinical sign> An early sign of measles, consisting in thin whitish patches on the gums and buccal mucous membrane, formed of desquamating epithelial cells. (05 Mar 2000) |
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| 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) |
| 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) |
| comfort zone | The temperature range between 28캜 and 30캜 at which the naked body is able to maintain the heat balance without either shivering or sweating; in the clothed body the range is from 13캜 to 21캜. (05 Mar 2000) |
| comitance | A characteristic of strabismus in which the misalignment of the eyes is maintained in all directions of gaze. (05 Mar 2000) |
| comitant | Having comitance; in a comitant strabismus the same angle of misalignment of the eyes is maintained in all directions of gaze. Synonym: concomitant. (05 Mar 2000) |
| comitant strabismus | A condition in which the degree of strabismus is the same in all directions of gaze. Synonym: concomitant strabismus. (05 Mar 2000) |
| comma bacillus | <bacteria> Bacterium that causes cholera, the life threatening aspects of which are caused by the exotoxin (see cholera toxin). Short, slightly curved rods, highly motile (single polar flagellum), gram-negative. Adhere to intestinal epithelium (adhesion mechanism unknown) and produce enzymes (neuraminidase, proteases) that facilitate access of the bacterium to the epithelial surface. (18 Nov 1997) |
| comma bundle of Schultze | A compact bundle composed of descending branches of posterior root fibres located near the border between the fasciculi gracilis and cuneatus of the cervical and thoracic spinal cord; it corresponds to the septomarginal fasciculus, Hoche's tract, or oval area of Flechsig in the lumbar, and to the triangle of Philippe-Gombault in the sacral spinal segments; like these, it can be demonstrated only in cases of demyelination resulting from dorsal root lesions. Synonym: fasciculus semilunaris, fasciculus interfascicularis, comma bundle of Schultze, comma tract of Schultze, interfascicular fasciculus. (05 Mar 2000) |