sub·ze·ro
| \ ˌsəb-ˈzē-(ˌ)rō
, -ˈzir-(ˌ)ō \
, -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
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“Subzero.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subzero. Accessed 23 May. 2022.
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Time Traveler for subzero
The first known use of subzero was in 1887
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