subzero

sub-ze·ro

[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. 2013.
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Collins
World English Dictionary
subzero (sʌbˈzɪərəʊ) [Click for IPA pronunciation guide]
 
adj
(esp of temperature) lower or less than zero

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Subzero is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
the offspring of a zebra and a donkey.
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