ETYM New Lat. Related to Indigo.
Soft, ductile, silver-white, metallic element, symbol In, atomic number 49, atomic weight 114.82. It occurs in nature in some zinc ores, is resistant to abrasion, and is used as a coating on metal parts. It was discovered 1863 by German metallurgists Ferdinand Reich (1799–1882) and Hieronymus Richter (1824–1898), who named it after the two indigo lines of its spectrum.
A rare soft silvery metallic element; occurs in small quantities in sphalerite; SYN. In, atomic number 49.