From The Collaborative International Dictionary of English v.0.48:

Cupola \Cu"po*la\ (k?"p?-l?), n.; pl. Cupolas (-l?z). [It.
   cupola, LL. cupula, cuppula (cf. L. cupula little tub). fr.
   cupa, cuppa, cup; cf. L. cupa tub. So called on account of
   its resemblance to a cup turned over. See Cup, and cf.
   1. (Arch.) A roof having a rounded form, hemispherical or
      nearly so; also, a ceiling having the same form. When on a
      large scale it is usually called dome.
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   2. A small structure standing on the top of a dome; a
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   3. A furnace for melting iron or other metals in large
      quantity, -- used chiefly in foundries and steel works.
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   4. A revolving shot-proof turret for heavy ordnance.
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   5. (Anat.) The top of the spire of the cochlea of the ear.
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From The Collaborative International Dictionary of English v.0.48:

Dome \Dome\, n. [See Doom.]
   Decision; judgment; opinion; a court decision. [Obs.]
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From The Collaborative International Dictionary of English v.0.48:

Dome \Dome\, n. [F. d[^o]me, It. duomo, fr. L. domus a house,
   domus Dei or Domini, house of the Lord, house of God; akin to
   Gr. ? house, ? to build, and E. timber. See Timber.]
   1. A building; a house; an edifice; -- used chiefly in
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            Approach the dome, the social banquet share. --Pope.
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   2. (Arch.) A cupola formed on a large scale.
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   Note: "The Italians apply the term il duomo to the principal
         church of a city, and the Germans call every cathedral
         church Dom; and it is supposed that the word in its
         present English sense has crept into use from the
         circumstance of such buildings being frequently
         surmounted by a cupola." --Am. Cyc.
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   3. Any erection resembling the dome or cupola of a building;
      as the upper part of a furnace, the vertical steam chamber
      on the top of a boiler, etc.
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   4. (Crystallog.) A prism formed by planes parallel to a
      lateral axis which meet above in a horizontal edge, like
      the roof of a house; also, one of the planes of such a
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   Note: If the plane is parallel to the longer diagonal
         (macrodiagonal) of the prism, it is called a macrodome;
         if parallel to the shorter (brachydiagonal), it is a
         brachydome; if parallel to the inclined diagonal in a
         monoclinic crystal, it is called a clinodome; if
         parallel to the orthodiagonal axis, an orthodome.
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