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1850, for Swedish astronomer Anders Celsius (1701-1744) inventor of the centigrade scale in 1742.
Celsius Cel·si·us (sěl'sē-əs, -shəs)
Of or relating to a temperature scale that registers the freezing point of water as 0° and the boiling point as 100° under normal atmospheric pressure.
Relating to a temperature scale on which the freezing point of water is 0° and the boiling point of water is 100° under normal atmospheric pressure. See Note at centigrade.