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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
{Cupule}.]
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
lantern.
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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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Dome \Dome\, n. [See {Doom}.]
Decision; judgment; opinion; a court decision. [Obs.]
--Chaucer.
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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
poetry.
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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
form.
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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.
--Dana.
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