| ulcus hypostaticum | <dermatology> A chronic ulcer that appears in pressure areas in debilitated patients confined to bed or otherwise immobilised, due to a circulatory defect from the enhanced tissue pressure in high-contact areas, often occurring over a bony prominence (for example sacral decubitus). (27 Sep 1997) |
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| ulcus terebrans | An obsolete term for an invasive basal cell carcinoma, usually around the eye, nose, or ear, and extending to underlying bony tissue. (05 Mar 2000) |
| ulcus venereum | <dermatology> The primary skin lesion of syphilis which begins at the site of infection after an interval of 10-30 days as a papule or red ulcerated skin lesion. (27 Sep 1997) |
| ulcus vulvae acutum | A simple acute ulceration of the vulva or lower vagina of nonvenereal origin. Synonym: ulcus vulvae acutum. (05 Mar 2000) |
| ule | <botany> A Mexican and Central American tree (Castilloa elastica and C. Markhamiana) related to the breadfruit tree. Its milky juice contains caoutchouc. Synonym: ule tree. Origin: Sp. Source: Websters Dictionary (01 Mar 1998) |
| ulectomy | An obsolete synonym for cicatrectomy. Origin: G. Oule, scar, + ektome, excision (05 Mar 2000) |
| ulegyria | A defect of the cerebral cortex characterised by narrow and distorted gyri; may be congenital or the result of scars. Origin: G. Oule, scar, + gyros, ring (05 Mar 2000) |
| ulerythema | Scarring with erythema. Origin: G. Oule, scar, + erythema, redness of the skin Ulerythema ophryogenes, folliculitis of the eyebrows resulting in scarring and alopecia. (05 Mar 2000) |
| ulerythema sycosiforme | A papular or pustular inflammation of the hair follicles of the beard, followed by punctuate scarring and loss of the hair. Synonym: ulerythema sycosiforme. Sycosis nuchae necrotisans, acne keloid on the back of the neck at the hairline. (05 Mar 2000) |
| uletomy | An obsolete synonym for cicatricotomy. Origin: G. Oule, scar, + tome, incision (05 Mar 2000) |
| ulex europaeus | A lectin that reacts specifically with alpha-l-fucose, used as a marker for endothelial cells in paraffin sections. (05 Mar 2000) |
| ulexite | <chemical> A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda. Origin: After a German chemist. Source: Websters Dictionary (01 Mar 1998) |
| uliginous | <botany> Describes a plant that grows in a swamp or wetland. (09 Oct 1997) |
| ullet | <zoology> A European owl (Syrnium aluco) of a tawny colour. Synonym: uluia. Origin: Cf. OF. Hullote, E. Howlet. Source: Websters Dictionary (01 Mar 1998) |
| Ullmann | Emerich, Hungarian surgeon, 1861-1937. See: Ullmann's line, Ullmann's syndrome. (05 Mar 2000) |