a Celsius scale for use in measuring temperatures above -183°C in which specified values are assigned to the ice point, steam point, and melting point of gold, silver, and antimony and the boiling point of sulfur and of oxygen.
INTERNATIONAL TEMPERATURE SCALE
Meaning of INTERNATIONAL TEMPERATURE SCALE in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012