Definitions for sub-zerosʌbˈzɪər oʊ
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Random House Webster's College Dictionary
sub-ze•rosʌbˈzɪər oʊ(adj.)
indicating or recording lower than zero on some scale, esp. on the Fahrenheit scale.
characterized by or appropriate for sub-zero temperatures.
Origin of sub-zero:
1930–35
Wiktionary
sub-zero(Adjective)
below 0u00B0C; freezing cold
Origin: sub- + zero
Citation
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"sub-zero." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/sub-zero>.