Meaning of the word sub-zero in English

What does sub-zero mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sub-zero

US /ˌsʌbˈzɪroʊ/
UK /ˌsʌbˈzɪərəʊ/
"sub-zero" picture

Adjective

referring to temperatures that are lower than zero degrees

Example:
The hikers had to endure sub-zero temperatures during the night.
It is dangerous to be outside in sub-zero conditions without proper gear.