Scale of temperature in which 0º represents the melting point of ice (7)

I believe the answer is:

celsius

(Other definitions for celsius that I've seen before include "Man responsible for scale" , "Scale of temperature devised by Swiss astronomer" , "Scale of temperature devised by Swedish astronomer" , "alternative to F spelt out?" , "Freezing point is 0 degrees on this scale" .)

I've seen this clue in The Mirror.

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