subzero

adjective sub·ze·ro \ ˌsəb-ˈzē-(ˌ)rō , -ˈzir-(ˌ)ō \
variants: or sub-zero

Definition of subzero

1 : registering less than zero on some scale (especially the Fahrenheit scale)
  • subzero temperatures
2 : characterized by or suitable for subzero temperatures
  • subzero winters
  • sub-zero snow boots
  • Here the altitude was almost a mile and a half above sea level and there was already hard frost in the mornings. With the first storm, the mornings would be subzero.
  • —Tony Hillerman

First Known Use of subzero

1887

in the meaning defined at sense 1

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