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Definition of Celsius scale
1. Noun. A temperature scale that defines the freezing point of water as 0 degrees and the boiling point of water as 100 degrees.
Medical Definition of Celsius scale
1. A temperature scale that is based upon the triple point of water (defined to be 273.16 K) and assigned the value of 0.01°C; this has replaced the centigrade scale because the triple point of water can be more accurately measured than the ice point; although, for most practical purposes, the two scales are equivalent. (05 Mar 2000)