| uletomy | An obsolete synonym for cicatricotomy. Origin: G. Oule, scar, + tome, incision (05 Mar 2000) |
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| 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) |
| Ullmann's line | The line of displacement in spondylolisthesis. (05 Mar 2000) |
| Ullmann's syndrome | <syndrome> A systemic angiomatosis due to multiple arteriovenous malformations. (05 Mar 2000) |
| ullmannite | <chemical> A brittle mineral of a steel-gray colour and metallic luster, containing antimony, arsenic, sulphur, and nickel. Origin: So named after J. C. Ullman, a German chemist. Source: Websters Dictionary (01 Mar 1998) |
| Ullrich | Otto, German physician, 1894-1957. See: Morquio-Ullrich disease. (05 Mar 2000) |
| ulluco | <botany> See Melluco. Source: Websters Dictionary (01 Mar 1998) |
| ulmaceous | <botany> Of or pertaining to a suborder of urticaceous plants, of which the elm is the type. Origin: L. Ulmus an elm. Source: Websters Dictionary (01 Mar 1998) |
| ulmate | <chemistry> A salt of ulmic acid. Source: Websters Dictionary (01 Mar 1998) |
| ulmic | <chemistry> Pertaining to ulmin; designating an acid obtained from ulmin. Origin: L. Ulmus an elm: cf. F. Ulmique. Source: Websters Dictionary (01 Mar 1998) |
| ulmin | <chemistry> A brown amorphous substance found in decaying vegetation. Cf. Humin. [Formerly written ulmine. Origin: L. Ulmus an elm: cf. F. Ulmine. Source: Websters Dictionary (01 Mar 1998) |