Definition of red-sear in US English:

red-sear

noun

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

Origin

Late 17th century; earliest use found in Randle Holme (1627–1700), herald painter. Probably originally from red-sear. In later use probably an alteration of either red-short, red-short, or redshire, after sear.

Pronunciation

red-sear

/ˌrɛdˈsɪə/