| rhea | <botany> The ramie or grass-cloth plant. See Grass-cloth plant, under Grass. <ornithology> Any one of three species of large South American ostrichlike birds of the genera Rhea and Pterocnemia. Called also the American ostrich. The common rhea, or nandou (Rhea Americana), ranges from Brazil to Patagonia. Darwin's rhea (Pterocnemia Darwinii), of Patagonia, is smaller, and has the legs feathered below the knee. Origin: L, a proper name. Source: Websters Dictionary (01 Mar 1998) |
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| rheae | <ornithology> A suborder of struthious birds including the rheas. Source: Websters Dictionary (01 Mar 1998) |
| rheeboc | <zoology> The peele. Alternative forms: reebok. Origin: D. Reebok roebuck. Source: Websters Dictionary (01 Mar 1998) |
| rhegma | A rent or fissure. Origin: G. Breakage (05 Mar 2000) |
| rhegmatogenous | Arising from a bursting or fractionating of an organ. See: rhegmatogenous retinal detachment. Origin: G. Rhegma, breakage, + -gen, producing (05 Mar 2000) |
| rhegmatogenous retinal detachment | Retinal separation associated with a break, a hole, or a tear in the sensory retina. (05 Mar 2000) |
| rheic | <chemistry> Pertaining to, or designating, an acid (commonly called chrysophanic acid) found in rhubarb (Rheum). Origin: NL. Rheum rhubarb, Gr. See Rhubarb. Source: Websters Dictionary (01 Mar 1998) |
| rhein | <chemistry> Chrysophanic acid. Source: Websters Dictionary (01 Mar 1998) |
| Rheinberg filter | <equipment> A colour-filter disk to be placed, as a dark field stop would be placed, below the substage condenser. The central circular area, that is filled with one of the two or three colour filters, should safely subtend the objective aperture. The annular quadrants around this are normally contrasting in colour. This is/are the colour shown by the organisms or other specimen detail against the coloured field. The effect is one kind of optical staining. (05 Aug 1998) |
| Rheinberg microscope | <instrument> A modified form of dark-field microscope in which the central opaque stop in the condenser is replaced by a coloured filter, producing a background of contrasting colour against which the specimen is illuminated. (05 Mar 2000) |
| rheinberry | <botany> One of the berries or drupes of the European buckthorn; also, the buckthorn itself. Origin: G. Rheinbeere. Source: Websters Dictionary (01 Mar 1998) |
| rhemish | Of or pertaining to Rheimis, or Reima, in France. Rhemish Testament, the English version of the new Testament used by Roman Catholics. See Douay Bible. Source: Websters Dictionary (01 Mar 1998) |
| rhenium | <chemical> Rhenium. A metal, atomic number 75, atomic weight 186.2, symbol re. Chemical name: Rhenium (12 Dec 1998) |
| rheo- | Blood flow; electrical current. Origin: G. Rheos, stream, current, flow (05 Mar 2000) |
| rheobase | The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, e.g., muscle or nerve. See: chronaxie. Synonym: galvanic threshold. Origin: rheo-+ G. Basis, a base (05 Mar 2000) |