sub-zero

below 0°C; freezing cold

Adjective

  1. below 0°C; freezing cold
    • Several days of sub-zero temperatures caused icicles up to 1.5 metres long to form in tunnels across Greater Manchester, Lancashire and Cumbria. - 2021 February 24, “Network News: NR takes pride in track teams as...
  2. below 0°F (−18°C)

Origin

Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Latin sub-der. English sub- English zero English sub-zero From sub- + zero.