| rhodin | A dihydroporphyrin derivative (the two additional hydrogens being at positions 17 and 18) of the type found in chlorophyll b and with a formyl group on position 7 rather than a methyl group. (05 Mar 2000) |
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| rhodium | <chemistry> A rare element of the light platinum group. It is found in platinum ores, and obtained free as a white inert metal which it is very difficult to fuse. Symbol Rh. Atomic weight 104.1. Specific gravity 12. Origin: NL, fr. Gr. "rodon the rose. So called from the rose-red colour of certain of its solutions. See Rhododendron. Source: Websters Dictionary (01 Mar 1998) |
| rhodizonic | <chemistry> Pertaining to, or designating, a colourless crystalline substance (called rhodizonic acid, and carboxylic acid) obtained from potassium carboxide and from certain quinones. It forms brilliant red, yellow, and purple salts. Origin: Gr. To be rose-red. Source: Websters Dictionary (01 Mar 1998) |
| rhodnius | A genus of true bugs of the subfamily triatominae (reduviidae). Its species are vectors of trypanosoma cruzi. (12 Dec 1998) |
| rhodo- | Rosy, red colour. Origin: G. Rhodon, rose (05 Mar 2000) |
| rhodobacter | A genus of gram-negative bacteria widely distributed in fresh water as well as marine and hypersaline habitats. (12 Dec 1998) |
| rhodobacter capsulatus | Non-pathogenic ovoid to rod-shaped bacteria that are widely distributed and found in fresh water as well as marine and hypersaline habitats. (12 Dec 1998) |
| rhodobacter sphaeroides | Spherical phototrophic bacteria found in mud and stagnant water exposed to light. (12 Dec 1998) |
| rhodochrosite | <chemical> Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite. Synonym: dialogite. Origin: Gr. "rodon the rose + a colouring. Source: Websters Dictionary (01 Mar 1998) |
| rhodococcus | A bacterial genus of the order actinomycetales. (12 Dec 1998) |
| rhodococcus equi | A species of rhodococcus found in soil, herbivore dung, and in the intestinal tract of cows, horses, sheep, and pigs. It causes bronchopneumonia in foals and can be responsible for infection in humans compromised by immunosuppressive drug therapy, lymphoma, or aids. (12 Dec 1998) |
| rhodocrinite | <paleontology> A rose encrinite. Origin: Gr. "rodon rose + lily. Source: Websters Dictionary (01 Mar 1998) |
| rhododendron | <botany> A genus of shrubs or small trees, often having handsome evergreen leaves, and remarkable for the beauty of their flowers; rosebay. Origin: L, fr. Gr. "rododendron, literally, rose tree; "rodon rose + dendron tree. See Rose. Source: Websters Dictionary (01 Mar 1998) |
| rhodogenesis | The production of rhodopsin by the combination of 11-cis-retinal and opsin in the dark. Origin: rhodopsin + G. Genesis, production (05 Mar 2000) |
| rhodonite | <chemical> Manganese spar, or silicate of manganese, a mineral occuring crystallized and in rose-red masses. It is often used as an ornamental stone. Origin: Gr. "rodon the rose. Source: Websters Dictionary (01 Mar 1998) |