Definition of cryosphere in US English:

cryosphere

noun

  • The part of the earth's surface where water exists as ice; the entire region of the natural environment that is below 0°C, especially permanently.

Origin

1930s. From cryo- + -sphere, after Polish kryosfera.

Pronunciation

cryosphere

/ˈkrʌɪə(ʊ)sfɪə/