titanium: Meaning and Definition of

ti•ta•ni•um

1. a dark-gray or silvery, lustrous, very hard, light, corrosion-resistant, metallic element, occurring combined in various minerals: used in metallurgy to remove oxygen and nitrogen from steel and to toughen it. Symbol: Ti; at. wt.: 47.90; at. no.: 22; sp. gr.: 4.5 at 20°C.