| L-Spar | asparaginase (Elspar) |
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| SPAR | sensitivity prediction by acoustic reflex |
| rhomb spar | <chemical> A variety of dolomite. Source: Websters Dictionary (01 Mar 1998) |
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| rhomb | 1. <geometry> An equilateral parallelogram, rhombohedron, or quadrilateral figure whose sides are equal and the opposite sides parallel. The angles may be unequal, two being obtuse and two acute, as in the cut, or the angles may be equal, in which case it is usually called a square. 2. <optics> Fresnel's rhomb, a rhomb or oblique parallelopiped of crown or St. Gobain glass so cut that a ray of light entering one of its faces at right angles shall emerge at right angles at the opposite face, after undergoing within the rhomb, at other faces, two reflections. It is used to produce a ray circularly polarized from a plane-polarized ray, or the reverse. Origin: L. Rhombus, Gr. Rhomb, a spinning top, magic wheel, fr. To turn or whirl round, perhaps akin to E. Wrench: cf. F. Rhombe. Cf. Rhombus, Rhumb. (23 Aug 1998) |
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| heavy spar | <chemical> Native barium sulphate or barite, so called because of its high specific gravity as compared with other non-metallic minerals. Source: Websters Dictionary (01 Mar 1998) |
| shiver-spar | <chemical> A variety of calcite, so called from its slaty structure. Synonym: slate spar. Origin: Cf. G. Schiefer-spath. Source: Websters Dictionary (01 Mar 1998) |
| spar | 1. A general term any round piece of timber used as a mast, yard, boom, or gaff. 2. Formerly, a piece of timber, in a general sense; still applied locally to rafters. 3. The bar of a gate or door. Spar buoy, a torpedo carried on the end of a spar usually projecting from the bow of a vessel, and intended to explode upon contact with an enemy's ships. Origin: OE. Sparre; akin to D. Spar, G. Sparren, OHG. Sparro, Dan.& Sw. Sparre, Icel. Sparri; of uncertain origin. 171. Cf. Spar. <chemical> An old name for a nonmetallic mineral, usually cleavable and somewhat lustrous; as, calc spar, or calcite, fluor spar, etc. It was especially used in the case of the gangue minerals of a metalliferous vein. Blue spar, Cube spar, etc. See Blue, Cube, etc. Origin: AS. Spaer in spaerstan chalkstone; akin to MHG. Spar, G. Sparkalk plaster. Source: Websters Dictionary (01 Mar 1998) |
| derbyshire spar | <chemical> A massive variety of fluor spar, found in Derbyshire, England, and wrought into vases and other ornamental work. Source: Websters Dictionary (01 Mar 1998) |
| iceland spar | <chemical> A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polarizcope, because of its strong double refraction. Cf. Calcite. Source: Websters Dictionary (01 Mar 1998) |
| fluor spar | <chemical> Calcium fluoride, a mineral of many different colours, white, yellow, purple, green, red, etc, often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor. Source: Websters Dictionary (01 Mar 1998) |
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