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[suhb-zeer-oh] /sʌbˈzɪər oʊ/
indicating or recording lower than zero on some scale, especially on the Fahrenheit scale:
a week of sub-zero temperatures.
characterized by or appropriate for sub-zero temperatures:
sub-zero climates; sub-zero clothing for the exploration.
Origin of sub-zero Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for sub-zero
Historical Examples
  • The sub-zero temperature of Meta's voice left no doubt as to what she wanted to do with her.

    The Ethical Engineer Henry Maxwell Dempsey
  • The Wing Commander stiffened and snorted like a Merlin backfiring on a sub-zero morning.

    A Yankee Flier with the R.A.F. Rutherford G. Montgomery
  • We have since found that it can and does heat the entire house even at sub-zero temperatures.

    If You're Going to Live in the Country Thomas H. Ormsbee and Richmond Huntley
  • During the day the heat would boil eggs, and at night the sub-zero cold cracked great scales off the granite boulders.

    Loot of the Void Edwin K. Sloat
  • They were all bundled in heavy garments, for the temperature of Callisto, never high, frequently drops to sub-zero readings.

    The Space Rover Edwin K. Sloat

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