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heating degree-day

American  

noun

  1. a degree-day below the standard temperature of 65°F or 19°C, used in estimating fuel consumption.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.