Definition of "Réaumur"

Réaumur

/ɹeɪəʊˈmjʊə(ɹ)/

noun
uncountable
1. Réaumur scale, a temperature scale in which the boiling point of water is 80 degrees and its freezing point is 0 degrees.
adjective
not comparable
1. (chiefly as postmodifier) Measured on the Réaumur scale.
  Quotations
  It is very cold,—fifteen degrees of frost Réaumur, but perfectly delicious, still, bright weather, and one feels jolly and energetic and amiably disposed towards everybody.
  1898, Elizabeth von Arnim, Elizabeth and her German Garden, Vintage, published 2017, page 97
  I am able to state that the morning of Sebastian's birth was a fine windless one, with twelve degrees (Réaumur) below zero….
  1941, Vladimir Nabokov, The Real Life of Sebastian Knight, Penguin 1971 edition, page 5