degree day

degree-day

[dih-gree-dey]
noun Engineering.
one degree of departure, on a single day, of the daily mean temperature from a given standard temperature. Abbreviation: dd
Also, degree day.


Origin:
1925–1930

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Collins
World English Dictionary
degree day
 
n
a day on which university degrees are conferred

degree-day
 
n
a unit used in estimating fuel requirements in heating buildings. It is equal to a fall of temperature of 1 degree below the mean outside temperature (usually taken as 18°C) for one day

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
degree-day  
A unit of measurement equal to a difference of one degree between the mean outdoor temperature on a certain day and a reference temperature. The unit is most often used in estimating the energy needs for heating or cooling a building (for example, heating degree-days and cooling degree-days). Originally, degree-days were used to determine the relationship between temperature and plant growth. The term continues to be used in life sciences as a measure of upper- and lower-temperature limits for organisms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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