Definitions for "Celsius scale"
The standard temperature scale in the metric system which sets the freezing point at 0 and the boiling point at 100 (compared to 32 and 212 degrees respectively in the more familiar Fahrenheit scale).
A temperature scale on which water freezes at 0 ° and boils at 100°.
The metric temperature scale for which 0°C is the temperature at which water freezes and 100°C is the temperature at which water boils, at standard atmospheric pressure. The conversion from Farenheit to Celsius is     C = ( F - 32 ) / 1.8