| sidereal | 1. Relating to the stars; starry; astral; as, sidereal astronomy. 2. <astronomy> Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day. Sidereal clock, day, month, year. See Clock, Day, etc. Sideral time, time as reckoned by sideral days, or, taking the sidereal day as the unit, the time elapsed since a transit of the vernal equinox, reckoned in parts of a sidereal day. This is, strictly, apparent sidereal time, mean sidereal time being reckoned from the transit, not of the true, but of the mean, equinoctial point. Origin: L. Sidereus, from sidus, sideris, a constellation, a star. Cf. Sideral, Consider, Desire. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| siderite | 1. <chemical> Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown colour. Called also sparry iron, spathic iron. A meteorite consisting solely of metallic iron. An indigo-blue variety of quartz. Formerly, magnetic iron ore, or loadstone. 2. <botany> Any plant of the genus Sideritis; ironwort. Origin: L. Sideritis loadstone, Gr, of iron, from iron. Source: Websters Dictionary (01 Mar 1998) |
| sidero- | Iron. Origin: G. Sideros (05 Mar 2000) |
| sideroblast | <haematology> Red blood cells containing Pappenheimer bodies, small, deeply basophilic granules that contain ferric iron. (09 Oct 1997) |
| sideroblastic anaemia | <haematology> A form of refractory anaemia caused by sideroblasts in the bone marrow. Origin: Gr. Haima = blood (09 Oct 1997) |
| sideroblastosis | <haematology> A condition characterised by and increased number of sideroblasts in the bloodstream. A sideroblast is an erythroblast containing granules of ferritin stained by the Prussian blue reaction. (09 Oct 1997) |
| siderocyte | An erythrocyte containing granules of free iron, as detected by the Prussian blue reaction, in the blood of normal foetuses, where they constitute from 0.10 to 4.5% of the erythrocytes. Origin: sidero-+ G. Kytos, cell (05 Mar 2000) |
| sideroderma | Brownish discoloration of the skin on the legs due to haemosiderin deposits. Origin: sidero-+ G. Derma, skin (05 Mar 2000) |
| siderofibrosis | Fibrosis associated with small foci in which iron is deposited. (05 Mar 2000) |
| siderogenous | Iron-forming. Origin: sidero-+ G. -gen, producing (05 Mar 2000) |
| siderographic | Of or pertaining to siderography; executed by engraved plates of steel; as, siderographic art; siderographic impressions. Source: Websters Dictionary (01 Mar 1998) |
| siderographical | Of or pertaining to siderography; executed by engraved plates of steel; as, siderographic art; siderographic impressions. Source: Websters Dictionary (01 Mar 1998) |
| siderographist | One skilled in siderography. Source: Websters Dictionary (01 Mar 1998) |
| siderography | The art or practice of steel engraving; especially, the process, invented by Perkins, of multiplying facsimiles of an engraved steel plate by first rolling over it, when hardened, a soft steel cylinder, and then rolling the cylinder, when hardened, over a soft steel plate, which thus becomes a facsimile of the original. The process has been superseded by electrotypy. Origin: Gr. Iron. Source: Websters Dictionary (01 Mar 1998) |
| sideromancy | Divination by burning straws on red-hot iron, and noting the manner of their burning. Origin: Gr. Iron + -mancy. Source: Websters Dictionary (01 Mar 1998) |