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sub-zero

[suhb-zeer-oh] /sʌbˈzɪər oʊ/
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for subzero

subzero

/sʌbˈzɪərəʊ/
adjective
1.
(esp of temperature) lower or less than zero
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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