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sub-zero

[suhb-zeer-oh]
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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 of sub-zero

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for subzero

subzero

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