1. A building; a house; an edifice; used chiefly in poetry. "Approach the dome, the social banquet share." (Pope)

2. A cupola formed on a large scale.

"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."

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.

4. <chemistry> 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.

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.

Origin: F. Dome, 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.

(01 Mar 1998)

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