dry rot
 枯萎;腐敗,腐敗現象


 Pow·der n.
 1. The fine particles to which any dry substance is reduced by pounding, grinding, or triturating, or into which it falls by decay; dust.
    Grind their bones to powder small.   --Shak.
 2. An explosive mixture used in gunnery, blasting, etc.; gunpowder. See Gunpowder.
 Atlas powder, Baking powder, etc. See under Atlas, Baking, etc.
 Powder down Zool., the peculiar dust, or exfoliation, of powder-down feathers.
 Powder-down feather Zool., one of a peculiar kind of modified feathers which sometimes form patches on certain parts of some birds. They have a greasy texture and a scaly exfoliation.
 Powder-down patch Zool., a tuft or patch of powder-down feathers.
 Powder hose, a tube of strong linen, about an inch in diameter, filled with powder and used in firing mines. --Farrow.
 Powder hoy Naut., a vessel specially fitted to carry powder for the supply of war ships. They are usually painted red and carry a red flag.
 Powder magazine, or Powder room. See Magazine, 2.
 Powder mine, a mine exploded by gunpowder. See Mine.
 Powder monkey Naut., a boy formerly employed on war vessels to carry powder; a powder boy.
 Powder post. See Dry rot, under Dry.
 Powder puff. See Puff, n.


 Pow·der-post·ed a. Affected with dry rot; reduced to dust by rot. See Dry rot, under Dry. [U.S.]

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 Rot, n.
 1. Process of rotting; decay; putrefaction.
 2. Bot. A disease or decay in fruits, leaves, or wood, supposed to be caused by minute fungi. See Bitter rot, Black rot, etc., below.
 3.  A fatal distemper which attacks sheep and sometimes other animals. It is due to the presence of a parasitic worm in the liver or gall bladder. See 1st Fluke, 2.
    His cattle must of rot and murrain die.   --Milton.
 Bitter rot Bot., a disease of apples, caused by the fungus Glaeosporium fructigenum. --F. L. Scribner.
 Black rot Bot., a disease of grapevines, attacking the leaves and fruit, caused by the fungus Laestadia Bidwellii. --F. L. Scribner.
 Dry rot Bot. See under Dry.
 Grinder's rot Med. See under Grinder.
 Potato rot. Bot. See under Potato.
 White rot Bot., a disease of grapes, first appearing in whitish pustules on the fruit, caused by the fungus Coniothyrium diplodiella. --F. L. Scribner.

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 Dry a. [Compar. Drier superl. Driest.]
 1. Free from moisture; having little humidity or none; arid; not wet or moist; deficient in the natural or normal supply of moisture, as rain or fluid of any kind; -- said especially: (a) Of the weather: Free from rain or mist.
    The weather, we agreed, was too dry for the season.   --Addison.
 (b) Of vegetable matter: Free from juices or sap; not succulent; not green; as, dry wood or hay. (c) Of animals: Not giving milk; as, the cow is dry. (d) Of persons: Thirsty; needing drink.
    Give the dry fool drink.   -- Shak
 (e) Of the eyes: Not shedding tears.
    Not a dry eye was to be seen in the assembly.   -- Prescott.
 (f) Med. Of certain morbid conditions, in which there is entire or comparative absence of moisture; as, dry gangrene; dry catarrh.
 2. Destitute of that which interests or amuses; barren; unembellished; jejune; plain.
    These epistles will become less dry, more susceptible of ornament.   --Pope.
 3. Characterized by a quality somewhat severe, grave, or hard; hence, sharp; keen; shrewd; quaint; as, a dry tone or manner; dry wit.
    He was rather a dry, shrewd kind of body.   --W. Irving.
 4. Fine Arts Exhibiting a sharp, frigid preciseness of execution, or the want of a delicate contour in form, and of easy transition in coloring.
 Dry area Arch., a small open space reserved outside the foundation of a building to guard it from damp.
 Dry blow. (a) Med. A blow which inflicts no wound, and causes no effusion of blood. (b) A quick, sharp blow.
 Dry bone Min., Smithsonite, or carbonate of zinc; -- a miner's term.
 Dry castor Zool. a kind of beaver; -- called also parchment beaver.
 Dry cupping. Med. See under Cupping.
 Dry dock. See under Dock.
 Dry fat. See Dry vat (below).
 Dry light, pure unobstructed light; hence, a clear, impartial view. --Bacon.
    The scientific man must keep his feelings under stern control, lest they obtrude into his researches, and color the dry light in which alone science desires to see its objects.   -- J. C. Shairp.
 -- Dry masonry. See Masonry.
 Dry measure, a system of measures of volume for dry or coarse articles, by the bushel, peck, etc.
 Dry pile Physics, a form of the Voltaic pile, constructed without the use of a liquid, affording a feeble current, and chiefly useful in the construction of electroscopes of great delicacy; -- called also Zamboni's, from the names of the two earliest constructors of it.
 Dry pipe Steam Engine, a pipe which conducts dry steam from a boiler.
 Dry plate Photog., a glass plate having a dry coating sensitive to light, upon which photographic negatives or pictures can be made, without moistening.
 Dry-plate process, the process of photographing with dry plates.
 Dry point. Fine Arts (a) An engraving made with the needle instead of the burin, in which the work is done nearly as in etching, but is finished without the use acid. (b) A print from such an engraving, usually upon paper. (c) Hence: The needle with which such an engraving is made.
 Dry rent Eng. Law, a rent reserved by deed, without a clause of distress. --Bouvier.
 Dry rot, a decay of timber, reducing its fibers to the condition of a dry powdery dust, often accompanied by the presence of a peculiar fungus (Merulius lacrymans), which is sometimes considered the cause of the decay; but it is more probable that the real cause is the decomposition of the wood itself. --D. C. Eaton. Called also sap rot, and, in the United States, powder post. --Hebert.
 Dry stove, a hothouse adapted to preserving the plants of arid climates. --Brande & C.
 Dry vat, a vat, basket, or other receptacle for dry articles.
 Dry wine, that in which the saccharine matter and fermentation were so exactly balanced, that they have wholly neutralized each other, and no sweetness is perceptible; -- opposed to sweet wine, in which the saccharine matter is in excess.


 dry rot
      n 1: a crumbling and drying of timber or bulbs or potatoes or
           fruit caused by a fungus
      2: a fungus causing dry rot