solar day

noun
1.
Astronomy. the time interval between two successive transits by the sun of the meridian directly opposite that of the observer; the 24-hour interval from one midnight to the following midnight.
2.
Law. the period of time from sunrise to sunset.

Origin:
1755–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
solar day
 
n
See day the period of time during which the earth makes one complete revolution on its axis relative to the sun

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
solar day  
See under solar time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The company also manufactures solar day-lighting products and distributes solar light tubes.
There are secular variations in this period, but they are much more predictable than the changes in the length of the solar day.
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