Definition from Wiktionary, the free dictionary
tempering (plural temperings)
- The act by which something is tempered.
1872, Louis Emmanuel Gruner, The Manufacture of Steel, page 29:
- Caron has, in fact, discovered this very curious circumstance, that a bar of steel becomes shorter under successive temperings, while it increases in size, laterally, in such a manner, that there actually is an increase of volume.