Meaning of red-sear in English:

red-sear

Pronunciation /ˌrɛdˈsɪə/

noun

rare Metallurgy
  • A defect of iron in which it becomes brittle when red-hot, typically due to an excess of sulphur in the metal; = red-shortness .

Origin

Late 17th century; earliest use found in Randle Holme (1627–1700), herald painter. Probably originally from red-sear.