a vault, having a circular plan and usually in the form of a portion of a sphere, so constructed as to exert an equal thrust in all directions.
a domical roof or ceiling.
a polygonal vault, ceiling, or roof.
any covering thought to resemble the hemispherical vault of a building or room: the great dome of the sky.
anything shaped like a hemisphere or inverted bowl.
(in a dam) a semidome having its convex surface toward the impounded water.
Crystallography. a form having planes that intersect the vertical axis and are parallel to one of the lateral axes.
Geology, upwarp.
Also called vistadome. Railroads. a raised, glass-enclosed section of the roof of a passenger car, placed over an elevated section of seats to afford passengers a full view of scenery.
Horology. an inner cover for the works of a watch, which snaps into the rim of the case.
a mountain peak having a rounded summit.
Slang. a person's head: I wish I could get the idea into that thick dome of yours.
verb (used with object), domed, doming.
to cover with or as if with a dome.
to shape like a dome.
verb (used without object), domed, doming.
to rise or swell as a dome.

1505–15; < Middle French dome < Italian duomo < Medieval Latin domus (Deī) house (of God), church; akin to timber

domelike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dome (dəʊm)
1.  a hemispherical roof or vault or a structure of similar form
2.  something shaped like this
3.  crystallog a crystal form in which two planes intersect along an edge parallel to a lateral axis
4.  a slang word for the head
5.  geology
 a.  a structure in which rock layers slope away in all directions from a central point
 b.  another name for pericline
6.  to cover with or as if with a dome
7.  to shape like a dome
[C16: from French, from Italian duomo cathedral, from Latin domus house]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"round, vaulted roof," 1656, from Fr. dome, from Prov. doma, from Gk. doma "house, housetop" (especially a style of roof from the east), related to domos "house" (see domestic). In the Middle Ages, Ger. dom and It. duomo were used for "cathedral" (on the notion of "God's
house"), so Eng. began to use this word in the sense "cupola," an architectural feature characteristic of It. cathedrals. Used in U.S. also with ref. to round summits of mountains.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
dome   (dōm)  Pronunciation Key 
  1. A circular or elliptical area of uplifted rock in which the rock dips gently away, in all directions, from a central point.

  2. A wedge-shaped mineral crystal that has two nonparallel, similarly inclined faces that intersect along a plane of symmetry.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The other is the dazzling golden dome that commands the sky-line.
By comparing one model to another, the scientists are able to keep tabs on how
  fast the lava dome is growing.
Under the dome of fading sky, the river cuts a twisting avenue through the
Paula loved a particular spot where the trees form a dome over a pond.
Images for dome
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