| Roscoe-Bunsen law | In two photochemical reactions, e.g., the darkening of a photographic plate or film, if the product of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will be equal; the retina for short periods of exposure obeys this law. Synonym: reciprocity law, Roscoe-Bunsen law. (05 Mar 2000) |
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| roscoelite | <chemical> A green micaceous mineral occurring in minute scales. It is essentially a silicate of aluminia and potash containing vanadium. Origin: From an English chemist, H.E. Roscoe. Source: Websters Dictionary (01 Mar 1998) |
| rose | 1. A flower and shrub of any species of the genus Rosa, of which there are many species, mostly found in the morthern hemispere Roses are shrubs with pinnate leaves and usually prickly stems. The flowers are large, and in the wild state have five petals of a colour varying from deep pink to white, or sometimes yellow. By cultivation and hybridizing the number of petals is greatly increased and the natural perfume enhanced. In this way many distinct classes of roses have been formed, as the Banksia, Baurbon, Boursalt, China, Noisette, hybrid perpetual, etc, with multitudes of varieties in nearly every class. 2. A knot of ribbon formed like a rose; a rose knot; a rosette, especially. One worn on a shoe. 3. A rose window. See Rose window, below. 4. A perforated nozzle, as of a pipe, spout, etc, for delivering water in fine jets; a rosehead; also, a strainer at the foot of a pump. 5. <medicine> The erysipelas. 6. The card of the mariner's compass; also, a circular card with radiating lines, used in other instruments. 7. The colour of a rose; rose-red; pink. 8. A diamond. See Rose diamond, below. Cabbage rose, China rose, etc. See Cabbage, China, etc. Corn rose, feuds between the Houses of York and Lancaster, the white rose being the badge of the House of York, and the red rose of the House of Lancaster. Origin: AS. Rose, L. Rosa, probably akin to Gr, Armor. Vard, OPer. Vareda; and perhaps to E. Wort: cf. F. Rose, from the Latin. Cf. Copperas, Rhododendron. Source: Websters Dictionary (01 Mar 1998) |
| rose bengal | <chemical> 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',4',5',7'-tetraiodospiro(isobenzofuran-1(3h),9'-(9h)xanthen)-3-one dipotassium salt. A bright bluish pink compound that has been used as a dye, biological stain, and diagnostic aid. Pharmacological action: fluorescent dyes. Chemical name: Rose Bengal (12 Dec 1998) |
| rose bengal radioactive test | A test of liver function used as a means of measuring hepatic blood flow and for scintillation scanning of the liver to determine size and contour of the liver, or the presence of space-occupying masses in the liver. (05 Mar 2000) |
| rose cephalic tetanus | A type of local tetanus that follows wounds to the face and head; after a brief incubation (1-2 days) the facial and ocular muscles become paretic yet undergo repeated tetanic spasms. The throat and tongue muscles may also be affected. Synonym: cerebral tetanus, head tetanus, hydrophobic tetanus, rose cephalic tetanus, Rose's cephalic tetanus. (05 Mar 2000) |
| rose cold | Allergic rhinitis occurring in the spring and early summer. (05 Mar 2000) |
| rose growers granuloma | <dermatology> A fungal skin infection caused by the fungus Sporothrix schenckii and commonly seen in gardeners. (27 Sep 1997) |
| rose hips | <botany> The fleshy, light coloured fruit of the rose. Rose hips are an extremely rich source of vitamin C, approximately 120 times as rich as oranges. (27 Sep 1997) |
| rose oil | A volatile oil from Rosa centifolia; used in perfumery and in ointments. Synonym: attar of rose. (05 Mar 2000) |
| rose spots | Characteristic exanthema of typhoid fever; 10-20 small pink papules on the lower trunk lasting a few days and leaving hyperpigmentation. (05 Mar 2000) |
| Rose's position | The patient lies on his back with the head falling down over the end of the table; used in operations within the mouth or pharynx. (05 Mar 2000) |
| Rose, Edmund | <person> German physician, 1836-1914. See: Rose's position, Rose's cephalic tetanus. (05 Mar 2000) |
| Rose, H | <person> U.S. Microbiologist, *1906. See: Rose-Waaler test. (05 Mar 2000) |
| Rose-Bradford kidney | A form of fibrotic kidney of inflammatory origin found in young persons. (05 Mar 2000) |