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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Merriam-Webster unabridged
Share subzero
Time Traveler for subzero
The first known use of subzero was in 1887
See more words from the same year