blue heat
chiefly Metallurgy
noun
A temperature at which iron or steel assumes a bluish tint as a result of becoming covered with a film of iron oxide, typically about 300°C; frequently figurative.
Origin
Late 18th century; earliest use found in John Smeaton (1724–1792), civil engineer.
- functionary
- function key
- functionless
- function room
- function word
- functor
- fund
- funda
- fundal
- fundament
- fundamental
- fundamental frequency
- fundamentalism
- fundamentalist
- fundamentality
- fundamentally
- fundamental note
- fundamental particle
- fundamental tone
- fundamental unit
- fun day
- funded debt
- funder
- fundholder
- fundholding