zodiacal light

noun
a luminous tract in the sky, seen in the west after sunset or in the east before sunrise and thought to be the light reflected from a cloud of meteoric matter revolving round the sun.

Origin:
1725–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
zodiacal light
 
n
a very faint cone of light in the sky, visible in the east just before sunrise and in the west just after sunset. It is probably due to the reflection of sunlight from cosmic dust in the plane of the ecliptic

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Dictionary.com's 21st Century Lexicon
Main Entry:  zodiacal light1
Part of Speech:  n
Definition:  See false dawn
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American Heritage
Science Dictionary
zodiacal light   (zō-dī'ə-kəl)  Pronunciation Key 
A faint hazy cone of light, often visible in the west just after sunset or in the east just before sunrise, and elongated in the direction of the ecliptic on each side of the Sun. It is apparently caused by the reflection of sunlight from meteoric particles in the plane of the ecliptic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If you watch closely, you might see the zodiacal light, a faint triangle of light extending up from the horizon.
That's called the zodiacal light, and is caused by the reflection of sunlight by dust in the plane of our solar system.
The zodiacal light-the faint glow of sunlight reflected off interplanetary dust-is easiest to see about now.
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