Having or resembling this shade of blue

(slang, idiomatic) Courage, audacity.

plural of steel guitar

Steel made directly from cast iron by burning out a portion of the carbon and other impurities that the latter contains, through the agency of a blast of air which is forced through the molten metal.

plural of Bessemer steel

A high-strength, but low-carbon, workable steel alloy with 15-25% nickel and lesser amounts of cobalt and other materials, that achieves it strength by a martensitic structure achieved by heat treatment and aging.

Damascus steel

plural of Damask steel

plural of Damascus steel

A kind of steel used in swordmaking from about 300 BC to 1700 AD, characterized by distinctive patterns of banding and mottling reminiscent of flowing water.