cryogen

n.
A liquid, such as liquid nitrogen, that boils at a temperature below about 110 K (−160°C) and is used to obtain very low temperatures; a refrigerant.

(krī'ə-jən)
n.

A liquid, such as liquid nitrogen, that boils at a temperature below about 110 Kelvin (−160°C) and is used to obtain very low temperatures; a refrigerant.

Substance used to lower temperature in tissue to be frozen, e.g. liquid nitrogen, Freon, carbon dioxide and nitrous oxide.

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The noun has one meaning:

Meaning #1: a liquid that boils at below -160 C and is used as a refrigerant

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