subzero

adjective
sub·​ze·​ro | \ ˌsəb-ˈzē-(ˌ)rō How to pronounce subzero (audio) , -ˈzir-(ˌ)ō \
variants: or sub-zero

Definition of subzero

1 : registering less than zero on some scale (especially the Fahrenheit scale) subzero temperatures
2 : characterized by or suitable for subzero temperatures subzero winters sub-zero snow boots Here the altitude was almost a mile and a half above sea level and there was already hard frost in the mornings. With the first storm, the mornings would be subzero.— Tony Hillerman

First Known Use of subzero

1887, in the meaning defined at sense 1

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Time Traveler for subzero

Time Traveler

The first known use of subzero was in 1887

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Cite this Entry

“Subzero.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subzero. Accessed 24 Feb. 2020.

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More Definitions for subzero

subzero

adjective
How to pronounce subzero (audio)

English Language Learners Definition of subzero

: below zero degrees : extremely cold

More from Merriam-Webster on subzero

Thesaurus: All synonyms and antonyms for subzero

Rhyming Dictionary: Words that rhyme with subzero

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