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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Dictionary Entries near subzero

subworld

subwriter

subxerophilous

subzero

subzone

suc

succ

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Time Traveler for subzero

The first known use of subzero was in 1887

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