winter solstice

noun Astronomy.
the solstice on or about December 21st that marks the beginning of winter in the Northern Hemisphere.

Origin:
1625–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
winter solstice
 
n
1.  the time at which the sun is at its southernmost point in the sky (northernmost point in the S hemisphere) appearing at noon at its lowest altitude above the horizon. It occurs about December 22 (June 21 in the S hemisphere)
2.  astronomy the point on the celestial sphere, opposite the summer solstice, at which the ecliptic is furthest south from the celestial equator. Right ascension: 18 hours; declination: --23.5°

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
winter solstice   (wĭn'tər)  Pronunciation Key 
See under solstice.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At the winter solstice, the longest night of the year, people of the city
  stayed awake eating pomegranates.
The head is aligned to the summer solstice sunset and the coils may point to
  the winter solstice sunrise.
The almanac relies on the tropical year, which runs from winter solstice to
  winter solstice.
The winter solstice is, of course, the shortest day of the year.
Images for winter solstice
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