What is spell celcius?

As an AI language model, I assume you meant "spell Celsius."

Celsius (also known as Centigrade) is a unit of temperature measurement named after the Swedish astronomer Anders Celsius. It is widely used as a standard unit of temperature measurement across various countries. The Celsius scale sets the freezing point (0°C) and boiling point (100°C) of water at standard pressure and is based on a scale of 100 degrees between these two points, with zero degrees representing the temperature at which ice melts.

To spell Celsius: C-E-L-S-I-U-S.