| UVA | Ultra Violet A |
|---|---|
| UVA | ureterovesical angle |
| PUVA | 5-methoxypsoralen and UVA |
|---|---|
| PUVA | Psoralen + UVA |
| PUVA | Psoralen and UVA |
| UVA | Ultraviolet A |
| UVA | Ultraviolet light A |
shading
| shade | 1. To shelter or screen by intercepting the rays of light; to keep off illumination from. "I went to crop the sylvan scenes, And shade our altars with their leafy greens." (Dryden) 2. To shelter; to cover from injury; to protect; to screen; to hide; as, to shade one's eyes. "Ere in our own house I do shade my head." (Shak) 3. To obscure; to dim the brightness of. "Thou shad'st The full blaze of thy beams." (Milton) 4. To pain in obscure colours; to darken. 5. To mark with gradations of light or colour. 6. To present a shadow or image of; to shadow forth; to represent. "[The goddess] in her person cunningly did shade That part of Justice which is Equity." (Spenser) Origin: Shaded; Shading. 1. Comparative obscurity owing to interception or interruption of the rays of light; partial darkness caused by the intervention of something between the space contemplated and the source of light. Shade differs from shadow as it implies no particular form or definite limit; whereas a shadow represents in form the object which intercepts the light. When we speak of the shade of a tree, we have no reference to its form; but when we speak of measuring a pyramid or other object by its shadow, we have reference to its form and extent. 2. Darkness; obscurity; often in the plural. "The shades of night were falling fast." (Longfellow) 3. An obscure place; a spot not exposed to light; hence, a secluded retreat. "Let us seek out some desolate shade, and there Weep our sad bosoms empty." (Shak) 4. That which intercepts, or shelters from, light or the direct rays of the sun; hence, also, that which protects from heat or currents of air; a screen; protection; shelter; cover; as, a lamp shade. "The Lord is thy shade upon thy right hand." (Ps. Cxxi. 5) "Sleep under a fresh tree's shade." (Shak) "Let the arched knife well sharpened now assail the spreading shades of vegetables." (J. Philips) 5. Shadow. "Envy will merit, as its shade, pursue." (Pope) 6. The soul after its separation from the body; so called because the ancients it to be perceptible to the sight, though not to the touch; a spirit; a ghost; as, the shades of departed heroes. "Swift as thought the flitting shade Thro' air his momentary journey made." (Dryden) 7. The darker portion of a picture; a less illuminated part. See Def. 1, above. 8. Degree or variation of colour, as darker or lighter, stronger or paler; as, a delicate shade of pink. "White, red, yellow, blue, with their several degrees, or shades and mixtures, as green only in by the eyes." (Locke) 9. A minute difference or variation, as of thought, belief, expression, etc.; also, the quality or degree of anything which is distinguished from others similar by slight differences; as, the shades of meaning in synonyms. "New shades and combinations of thought." (De Quincey) "Every shade of religious and political opinion has its own headquarters." (Macaulay) The Shades, the Nether World; the supposed abode of souls after leaving the body. Origin: OE. Shade, shadewe, schadewe, AS. Sceadu, scead; akin to OS. Skado, D. Schaduw, OHG. Scato, (gen. Scatewes), G. Schatten, Goth. Skadus, Ir. & Gael. Sgath, and probably to Gr. Darkness. Cf. Shadow, Shed a hat. Source: Websters Dictionary (01 Mar 1998) |
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| guard | 1. One who, or that which, guards from injury, danger, exposure, or attack; defense; protection. "His greatness was no guard to bar heaven's shaft." (Shak) 2. A man, or body of men, stationed to protect or control a person or position; a watch; a sentinel. "The guard which kept the door of the king's house." Kings xiv. 27. 3. One who has charge of a mail coach or a railway train; a conductor. 4. Any fixture or attachment designed to protect or secure against injury, soiling, or defacement, theft or loss; as: That part of a sword hilt which protects the hand. Ornamental lace or hem protecting the edge of a garment. A chain or cord for fastening a watch to one's person or dress. A fence or rail to prevent falling from the deck of a vessel. An extension of the deck of a vessel beyond the hull; especially, in side-wheel steam vessels, the framework of strong timbers, which curves out on each side beyond the paddle wheel, and protects it and the shaft against collision. A plate of metal, beneath the stock, or the lock frame, of a gun or pistol, having a loop, called a bow, to protect the trigger. An interleaved strip at the back, as in a scrap book, to guard against its breaking when filled. 5. A posture of defense in fencing, and in bayonet and saber exercise. 6. An expression or admission intended to secure against objections or censure. "They have expressed themselves with as few guards and restrictions as I." (Atterbury) 7. Watch; heed; care; attention; as, to keep guard. 8. <zoology> The fibrous sheath which covers the phragmacone of the Belemnites. Guard is often used adjectively or in combination; as, guard boat or guardboat; guardroom or guard room; guard duty. Advanced guard, Coast guard, etc. See Advanced, Coast, etc. Grand guard, one of the posts of the second line belonging to a system of advance posts of an army. Guard boat. A boat appointed to row the rounds among ships of war in a harbor, to see that their officers keep a good lookout. A boat used by harbor authorities to enforce the observance of quarantine regulations. <botany> Guard cells, to go on duty as a guard or sentinel. To run the guard, to pass the watch or sentinel without leave. Synonym: Defense, shield, protection, safeguard, convoy, escort, care, attention, watch, heed. Origin: OF. Guarde, F. Garde; of German origin; cf. OHG. Wart, marto, one who watches, mata a watching, Goth. Wardja watchman. See Guard. Source: Websters Dictionary (01 Mar 1998) |
| guard cell | <plant biology> Plant cells occurring in pairs in the epidermis, flanking each stoma. Changes in turgor in the guard cells cause the stoma to open and close. (18 Nov 1997) |
| uva | <botany> A small pulpy or juicy fruit containing several seeds and having a thin skin, as a grape. Origin: L, a grape. Source: Websters Dictionary (01 Mar 1998) |
| uva ursi | The dried leaves of Arctostaphylos uva-ursi (family Ericaceae), bearberry, mountain box, a common plant of the north temperate zone; contains antiseptic glycosides, arbutin, methylarbutin, and tannins; has been used in chronic inflammations of the urinary tract. Origin: L. Uva, grape + ursus, bear (05 Mar 2000) |
| uva-ursi | <botany> The bearberry. Origin: NL, fr. L. Uva grape + ursus bear. Source: Websters Dictionary (01 Mar 1998) |
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