| ros | <oncogene> An oncogene, identified in bird sarcoma, encoding a receptor tyrosine kinase. (18 Nov 1997) |
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| Rosa | A genus of plants including the roses (family Rosaceae); several varieties are the sources of rose oil: Rosa alba, cottage rose; Rosa centifolia, the pale rose or cabbage rose (source of official rose oil); Rosa damascena, damask rose; and Rosa gallica, red rose or French rose. Origin: L. Rose (05 Mar 2000) |
| rosacea | <dermatology> A facial skin disorder which results from chronic inflammation of the cheeks, nose, chin, forehead, and-or eyelids. This is often demonstrated by increased redness or acne-like eruptions in these locations on the face. (15 Nov 1997) |
| rosacea-like tuberculid | Papular lesions in rosacea, characterised microscopically by perifollicular granulomas with central necrosis and scattered giant cells. Lupus miliaris disseminatus faciei is probably a form of granulomatous rosacea. Synonym: rosacea-like tuberculid, tuberculoid rosacea. (05 Mar 2000) |
| rosaceous | 1. <botany> Of or pertaining to a natural order of plants (Rosaceae) of which the rose is the type. It includes also the plums and cherries, meadowsweet, brambles, the strawberry, the hawthorn, applies, pears, service tress, and quinces. Like a rose in shape or appearance; as, a rosaceous corolla. 2. Of a pure purpish pink colour. Origin: L. Rosaceus, fr. Rosa rose. Source: Websters Dictionary (01 Mar 1998) |
| rosacic | <medicine> Pertaining to, or designating, an acid (called also lithic acid) found in certain red precipitates of urine. See Uric. See: Rosaceous. Source: Websters Dictionary (01 Mar 1998) |
| Rosai-Dorman disease | A chronic disease occurring in children and characterised by massive painless cervical lymphadenopathy due to distension of the lymphatic sinuses by macrophages containing ingested lymphocytes, and by capsular and pericapsular fibrosis. Synonym: Rosai-Dorman disease. (05 Mar 2000) |
| rosales | An order of the angiosperms, subclass rosidae. Its members include some of the most known ornamental and edible plants of temperate zones including roses, apples, cherries, and peaches. Plants of a number of the species of the rose family contain cyanide compounds, for example, peach pits and bitter almonds. (12 Dec 1998) |
| rosanilin | A tris(aminophenyl)methyl compound; together with pararosanilin it is a component of basic fuchsin; also used as an antifungal agent. (05 Mar 2000) |
| rosanilin dyes | Several triaminotriphenylmethane dye's or mixtures of them often sold under the name of basic fuchsin; rosanilin dye's differ from other triphenylmethane dye's in that the amino groups are unsubstituted, and they may have methyl groups introduced directly onto the benzene rings; the four possible such dyes are pararosanilin, rosanilin, new fuchsin, and magenta II. (05 Mar 2000) |
| rosaniline | <chemistry> A complex nitrogenous base, C20H21N3O, obtained by oxidizing a mixture of aniline and toluidine, as a colourless crystalline substance which forms red salts. These salts are essential components of many of the socalled aniline dyes, as fuchsine, aniline red, etc. By extension, any one of the series of substances derived from, or related to, rosaniline proper. Origin: Rose + aniline. Source: Websters Dictionary (01 Mar 1998) |
| rosaniline dyes | Any dye or mixture of dyes made from rosaniline, a red triphenylmethane aniline derivative; used to colour fabrics, paper and as biological stain; also used as disinfectant and topical antifungal agent. (12 Dec 1998) |
| rosaprostol | A prostaglandin analog with protective properties for the gastric mucosa. Similar to misoprostol and also used as an antiulcerative drug. (05 Mar 2000) |
| rosary | Origin: LL. Rosarium a string of beads, L. Rosarium a place planted with roses, rosa a rose: cf. F. Rosaire. See Rose. 1. A bed of roses, or place where roses grow. "Thick rosaries of scented thorn." 2. A series of prayers (see Note below) arranged to be recited in order, on beads; also, a string of beads by which the prayers are counted. "His idolized book, and the whole rosary of his prayers." (Milton) A rosary consists of fifteen decades. Each decade contains ten Ave Marias marked by small beads, preceded by a Paternoster, marked by a larger bead, and concluded by a Gloria Patri. Five decades make a chaplet, a third part of the rosary. 3. A chapelet; a garland; a series or collection, as of beautiful thoughts or of literary selections. "Every day propound to yourself a rosary or chaplet of good works to present to God at night." (Jer. Taylor) 4. A coin bearing the figure of a rose, fraudulently circulated in Ireland in the 13th century for a penny. <zoology> Rosary shell, any marine gastropod shell of the genus Monodonta. They are top-shaped, bright-coloured and pearly. Source: Websters Dictionary (01 Mar 1998) |
| Roscoe, Sir Henry | <person> British chemist, 1833-1915. See: Bunsen-Roscoe law. (05 Mar 2000) |