celsius

> Celsius, centigrade and Fahrenheit
Celsius, centigrade and Fahrenheit are all scales of temperature. Celsius and centigrade mean the same and refer to a scale on which water freezes at O and boils at 100. This scale is now the principal unit of temperature. Celsius is now the more acceptable term. Fahrenheit refers to a scale on which water freezes at 32 and boils at 212. It is still used, informally at least, of the weather, and statements such as "The temperature reached the nineties today" are still common.
Note the initial capital letters in Celsius and Fahrenheit. This is because they are named after people, namely the scientists who devised them.