| REE | rapid extinction effect; rare earth element; resting energy expenditure |
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| NRBC | National Rare Blood Club; normal red blood cell; nucleated red blood cell |
| RARE | rapid acquisition with relaxation enhancement |
| Nutcracker syndrome | the vein from the left kidney is obstructed by one of the major arteries leaving the aorta. It can c... |
| REE | Rare Earth Elements |
|---|---|
| LEO | Low Earth Orbit |
| RARE | RA response element |
| RARE | RA responsive element |
| RARE | Rapid Acquisition Relaxation Enhanced |
| rare earth elements | Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another. Synonym: rare earth elements. Origin: Lanthanum, first element of the series (05 Mar 2000) |
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| rare earth metal | Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another. Synonym: rare earth elements. Origin: Lanthanum, first element of the series (05 Mar 2000) |
| rare earths | See: lanthanides. (05 Mar 2000) |
| rare-earth screen | An intensifying screen made of a rare-earth oxide phosphor, more efficient than calcium tungstate, especially at the higher kilovoltages used in modern radiography. (05 Mar 2000) |
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| metals, rare earth | Elements of group IIIb of the periodic table from lanthanum, atomic number 57, to and including lutetium, atomic number 71. (12 Dec 1998) |
| rare | 1. Not frequent; seldom met with or occurring; unusual; as, a rare event. 2. Of an uncommon nature; unusually excellent; valuable to a degree seldom found. "Rare work, all filled with terror and delight." (Cowley) "Above the rest I judge one beauty rare." (Dryden) 3. Thinly scattered; dispersed. "Those rare and solitary, three in flocks." (Milton) 4. Characterised by wide separation of parts; of loose texture; not thick or dense; thin; as, a rare atmosphere at high elevations. "Water is nineteen times lighter, and by consequence nineteen times rarer, than gold." (Sir I. Newton) Synonym: Scarce, infrequent, unusual, uncommon, singular, extraordinary, incomparable. Rare, Scarce. We call a thing rare when but few examples, specimens, or instances of it are ever to be met with; as, a rare plant. We speak of a thing as scarce, which, though usually abundant, is for the time being to be had only in diminished quantities; as, a bad harvest makes corn scarce. "A perfect union of wit and judgment is one of the rarest things in the world." (Burke) "When any particular piece of money grew very scarce, it was often recoined by a succeeding emperor." (Addison) Origin: F, fr. L. Rarus thin, rare. Source: Websters Dictionary (01 Mar 1998) |
| rare species | A species of animal or plant that is considered rare, threatened, or endangered. (17 Dec 1997) |
| alkali earth metal | See: alkaline earth elements. (05 Mar 2000) |
| alkaline earth | <chemistry> Any of the metallic elements found in the second column of the periodic table, such as calcium and magnesium. (09 Oct 1997) |
| alkaline earth elements | Those element's in the family Be, Mg, Ca, Sr, Ba, and Ra, the hydroxides of which are highly ionised and hence alkaline in water solution. (05 Mar 2000) |
| metals, alkaline earth | Metals that constitute the group IIa in the periodic table. (12 Dec 1998) |
| diatomaceous earth | A type of silica-rich dirt which is soft, fine-grained, porous, light-coloured, and composed of the skeletons of diatoms (one-celled marine organisms with skeletons based on silicon). It is used as a filter. (09 Oct 1997) |
| earth | 1. <astronomy> Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the solar system. 2. The softer inorganic matter composing part of the surface of the globe, in distinction from the firm rock; soil of all kinds, including gravel, clay, loam, and the like; sometimes, soil favorable to the growth of plants; the visible surface of the globe; the ground; as, loose earth; rich earth. "Give him a little earth for charity." (Shak) 3. <chemistry> Any earthy-looking metallic oxide, as alumina, glucina, zirconia, yttria, and thoria. A similar oxide, having a slight alkaline reaction, as lime, magnesia, strontia, baryta. 4. Earth is used either adjectively or in combination to form compound words; as, earth apple or earth-apple; earth metal or earth-metal; earth closet or earth-closet. Adamic earth, Bitter earth, Bog earth, Chian earth, etc. See Adamic, Bitter, etc. Alkaline earths. See Alkaline. Earth apple. Origin: AS. Eore; akin to OS. Ertha, OFries. Irthe, D. Aarde, OHG. Erda, G. Erde, Icel. Jor, Sw. & Dan. Jord, Goth. Airpa, OHG. Ero, Gr, adv, to earth, and perh. To E. Ear to plow. Source: Websters Dictionary (25 Jun 1999) |
| earth-eating | Geophagismgeophagy The practice of eating dirt or clay. Synonym: dirt-eating, earth-eating. Origin: Geo-+ G. Phago, to eat (05 Mar 2000) |
| earth flax | <chemical> A variety of asbestus. See Amianthus. Source: Websters Dictionary (01 Mar 1998) |
| earth-tongue | <botany> A fungus of the genus Geoglossum. Source: Websters Dictionary (01 Mar 1998) |
| earth wax | A natural mixture of hydrocarbons of high molecular weight; a substitute for beeswax, also used in dentistry for impressions. Synonym: cerin, cerosin, earth wax, mineral wax, purified ozokerite. (05 Mar 2000) |
| fuller's earth | An amorphous variety of kaolin of varying composition, containing an aluminum magnesium silicate. The name is derived from an ancient process of cleansing or "fulling" wool to remove the oil and dirt particles with a water slurry of earth or clay. A refined clay sometimes used as a dusting powder or applied moistened with water as a form of poultice. Currently refers to any clay that can be used for the purpose of decolorizing in oil refining. Used as decoloriser for oils and other liquids, filtering medium, filler for rubber, and in agricultural formulations. Origin: fr. Fulling, an old process of cleaning wool, with earth or clay (05 Mar 2000) |
| rare earth |
any element of the lanthanide series (atomic numbers 57 through 71)
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| rare earth |
A rare earth is an oxide of a rare earth element. Often rare earth elements themselves are loosely called "rare earths".As to exactly what is a "rare earth" element is a matter of some ambiguity. The narrowest definition restricts it to the lanthanides, which are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. ...
Ãâó: en.wikipedia.org/wiki/Rare_earth
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| rare earth e.’s |
elements of the lanthanum series, comprising elements with atomic numbers 57 to 71.
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| rare earth phosphor |
An element such as yttrium, gadolinium, or lanthanum, that is used for ultra-high-speed radiographic intensification screens.
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| rare earth | any element of the lanthanide series (atomic numbers 57 through 71) |
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