ash cloud definition, ash cloud meaning | English dictionary

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1    a mass of water or ice particles visible in the sky, usually white or grey, from which rain or snow falls when the particles coagulate  
   See also       cirrus       cumulonimbus       cumulus       stratus  
2    any collection of particles visible in the air, esp. of smoke or dust  
3    a large number of insects or other small animals in flight  
4    something that darkens, threatens, or carries gloom  
5      (Jewellery)   a cloudlike blemish in a transparent stone  
6    in the clouds   not in contact with reality  
7    under a cloud  
a    under reproach or suspicion  
b    in a state of gloom or bad temper  
8    on cloud nine  
Informal   elated; very happy  
9    when intr, often foll by: over or up   to make or become cloudy, overcast, or indistinct  
10    tr   to make obscure; darken  
11    tr   to confuse or impair  
emotion clouded his judgment     
12    to make or become gloomy or depressed  
13    tr   to place under or render liable to suspicion or disgrace  
14    to render (liquids) milky or dull or (of liquids) to become milky or dull  
15    to become or render mottled or variegated  
     (C13 (in the sense: a mass of vapour): from Old English clud rock, hill; probably related to clod)  
  cloudless      adj  
  cloudlessly      adv  
  cloudlessness      n  
  cloudlike      adj  

cloud chamber  
      n     (Physics)   an apparatus for detecting high-energy particles by observing their tracks through a chamber containing a supersaturated vapour. Each particle ionizes molecules along its path and small droplets condense on them to produce a visible track,   (Also called)    Wilson cloud chamber  
cloud-cuckoo-land   , cloudland  
      n   a realm of fantasy, dreams, or impractical notions  
cloud rack  
      n   a group of moving clouds  
funnel cloud  
      n   a whirling column of cloud extending downwards from the base of a cumulonimbus cloud: part of a waterspout or tornado  
Magellanic Cloud  
      n   either of two small irregular galaxies, the Large Magellanic Cloud (Nubecula Major) and the Small Magellanic Cloud (Nubecula Minor), lying near the S celestial pole; they are probably satellites of the Galaxy. Distances: 163000 light years (Large), 196000 light years (Small)  
molecular cloud  
      n   a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming  
mushroom cloud  
      n   the large mushroom-shaped cloud of dust, debris, etc. produced by a nuclear explosion  
Saint-Cloud     (French)  
      n   usually abbreviated to   , St-Cloud   a residential suburb of Paris: former royal palace; Sèvres porcelain factory. Pop.: 28670 (1990)  
storm cloud  
1    a heavy dark cloud presaging rain or a storm  
2    a herald of disturbance, anger, or violence  
the storm clouds of war     
Wilson cloud chamber  
      n      the full name for       cloud chamber  
English Collins Dictionary - English Definition & Thesaurus  
Collaborative Dictionary     English Definition
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