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noun, plural Au·ro·ras, Au·ro·rae [uh-rawr-ee, uh-rohr-ee] for 2, 3.
2.
(lowercase) dawn.
3.
(lowercase) Meteorology. a radiant emission from the upper atmosphere that occurs sporadically over the middle and high latitudes of both hemispheres in the form of luminous bands, streamers, or the like, caused by the bombardment of the atmosphere with charged solar particles that are being guided along the earth's magnetic lines of force.
4.
a city in central Colorado, near Denver. 158,588.
5.
EXPANDa city in NE Illinois. 81,293.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Aurora
is always a great word to know.
So is steam fog. Does it mean:
| fog caused by cold air flowing over a body of comparatively warm water and giving the appearance of smoke or steam |
| the layer of the upper atmosphere where most atmospheric ozone is concentrated, from about 8 to 30 mi. (12 to 48 km) above the earth |
Example Sentences
- But they found it kept working thanks to the power from the aurora.
- It also displays a glowing aurora caused by bombarding.
- One such aurora is illustrated on the planet at the bottom of the picture.
Collins
World English Dictionary
| Aurora2 (ɔːˈrɔːrə) | |
| —n | |
| another name for Maewo | |
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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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History
aurora
late 14c., from L. Aurora, the Roman goddess of dawn, from PIE *ausus- "dawn," also the name of the Indo-European goddess of the dawn, from base *aus- "to shine," especially of the dawn (cf. Gk. eos "dawn," auein "to dry, kindle;" Skt. usah, Lith. ausra "dawn;" L. auster "south wind," usum "to burn;"
EXPANDO.E. east "east").
COLLAPSE
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
aurora  (ə-rôr'ə) Pronunciation Key
Plural auroras or aurorae (ə-rôr'ē) A brilliant display of bands or folds of variously colored light in the sky at night, especially in polar regions. Charged particles from the solar wind are channeled through the Earth's magnetic field into the polar regions. There the particles collide with atoms and molecules in the upper atmosphere, ionizing them and making them glow. Auroras are of greatest intensity and extent during periods of increased sunspot activity, when they often interfere with telecommunications on Earth. ◇ An aurora that occurs in southern latitudes is called an aurora australis (ô-strā'lĭs) or southern lights. When it occurs in northern latitudes it is called an aurora borealis (bôr'ē-āl'ĭs) or northern lights. See also magnetic storm. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary
Aurora definition
["The Aurora Or-Parallel Prolog System", E. Lusk et al, Proc 3rd Intl Conf on Fifth Generation Comp Systems, pp. 819-830, ICOT, A-W 1988].
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