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Discover LudwigThe word "sub-zero" is a correct and usable term in written English
It is often used as an adjective to describe a temperature far below 0° Celsius or 32° Fahrenheit. For example: "The sub-zero temperatures made it difficult to walk outside without appropriate winter garments."
Dictionary
sub-zero
adjective
Below 0C; freezing cold
Exact(57)
In sub-zero temperatures.
The temperature was sub-zero.
Sub-Zero is a sponsor.
One man smirked and said, "Sub-Zero".
They were sub-standard in sub-zero temperatures.
427R Wine/Refrigerator by Sub-Zero, from $8,400.
Kitchens are equipped with Sub-Zero refrigerators and Bosch dishwashers.
The kitchen comes with Sub-Zero and Wolf appliances.
Quickly, though, the fanciful plot develops a sub-zero chill.
It might even be sub-zero or arctic.
Even in sub-zero temperatures, the display keeps on working.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com