/ ˈselsiəs; NAmE / (also centi·grade ) adjective
( abbr. C ) of or using a scale of temperature in which water freezes at 0° and boils at 100° :
It will be a mild night, around nine degrees Celsius.
the Celsius Scale
► Cel·sius noun [ U ]:
temperatures in Celsius and Fahrenheit
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WORD ORIGIN
mid 19th cent.: named after Anders Celsius , the Swedish astronomer who invented the temperature scale.