subzero

sub-zero

[suhb-zeer-oh]
adjective
1.
indicating or recording lower than zero on some scale, especially on the Fahrenheit scale: a week of sub-zero temperatures.
2.
characterized by or appropriate for sub-zero temperatures: sub-zero climates; sub-zero clothing for the exploration.

Origin:
sub- + zero

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
subzero (sʌbˈzɪərəʊ)
 
adj
(esp of temperature) lower or less than zero

Collins English Dictionary - Complete & Unabridged 10th Edition
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