| EPO | eosinophil peroxidase; erythropoiesis; erythropoietin; evening primrose-oil; exclusive provider orga... |
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| SPF | skin protection factor; specific-pathogen free; spectrophotofluorometer; S-phase fraction; split pro... |
| SUN | standard unit of nomenclature; serum urea nitrogen |
| EPO | Evening Primrose Oil |
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| SUN | Serum Urea Nitrogen |
| SPF | Sun Protection Factor |
| evening | 1. The latter part and close of the day, and the beginning of darkness or night; properly, the decline of the day, or of the sum. "In the ascending scale Of heaven, the stars that usher evening rose." (Milton) Sometimes, especially in the Southern parts of the United States, the afternoon is called evening. 2. The latter portion, as of life; the declining period, as of strength or glory. Sometimes used adjectively; as, evening gun. "Evening Prayer. <botany> " Evening flower, an American singing bird (Coccothraustes vespertina) having a very large bill. Its colour is olivaceous, with the crown, wings, and tail black, and the under tail coverts yellow. So called because it sings in the evening. Evening primrose. See Primrose. The evening star, the bright star of early evening in the western sky, soon passing below the horizon; specifically, the planet Venus; called also Vesper and Hesperus. During portions of the year, Mars, Jupiter, and Saturn are also evening stars. See Morning Star. Origin: AS. Afnung. See even, and cf. Eve. Source: Websters Dictionary (01 Mar 1998) |
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| setting sun sign | <clinical sign> Retraction of the upper lid without upgaze so that the iris seems to "set" below the lower lid; suggestive of neurologic damage in the newborn, but usually clears up without sequelae. See: Collier's sign, Epstein's sign. (05 Mar 2000) |
| sun | <botany> See Sunn. 1. The luminous orb, the light of which constitutes day, and its absence night; the central body round which the earth and planets revolve, by which they are held in their orbits, and from which they receive light and heat. Its mean distance from the earth is about 92,500,000 miles, and its diameter about 860,000. Its mean apparent diameter as seen from the earth is 32' 4<sec/, and it revolves on its own axis once in 25 1/3 days. Its mean density is about one fourth of that of the earth, or 1.41, that of water being unity. Its luminous surface is called the photosphere, above which is an envelope consisting partly of hydrogen, called the chromosphere, which can be seen only through the spectroscope, or at the time of a total solar eclipse. Above the chromosphere, and sometimes extending out millions of miles, are luminous rays or streams of light which are visible only at the time of a total eclipse, forming the solar corona. 2. Any heavenly body which forms the center of a system of orbs. 3. The direct light or warmth of the sun; sunshine. "Lambs that did frisk in the sun." (Shak) 4. That which resembles the sun, as in splendor or importance; any source of light, warmth, or animation. "For the Lord God is a sun and shield." (Ps. Lxxiv. 11) "I will never consent to put out the sun of sovereignity to posterity. <medicine>" (Eikon Basilike) Sun and planet wheels See Sun and planet wheels, above. Under the sun, in the world; on earth. "There is no new thing under the sun." Sun is often used in the formation of compound adjectives of obvious meaning; as, sun-bright, sun-dried, sun-gilt, sunlike, sun-lit, sun-scorched, and the like. Origin: OE. Sunne, sonne, AS. Sunne; akin to OFries. Sunne, D. Zon, OS. & OHG. Sunna, G. Sonne, Icel. Sunna, Goth. Sunna; perh. Fr. Same root as L. Sol. 297. Cf. Solar, South. Source: Websters Dictionary (01 Mar 1998) |
| sun protection factor | A number on a scale (from 2 upwards) for rating sunscreens. Sunscreens with an spt of 15 or higher provide the best protection from the sun's harmful rays. (12 Dec 1998) |
| sun star | <zoology> See Sun star, under Sun. Source: Websters Dictionary (01 Mar 1998) |
| sun-struck | <medicine> Overcome by, or affected with, sunstroke; as, sun-struck soldiers. Source: Websters Dictionary (01 Mar 1998) |
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