D defs.my
Entry 2 senses Webster, 1913

Steely

/(-y̆)/ · Steel·y · IPA /ˈstiːli/
01 a. Made of steel; consisting of steel.
  1. 1.
    Made of steel; consisting of steel.
    “Around his shop the steely sparkles flew.” Gay.
  2. 2.
    Resembling steel; hard; firm; having the color of steel.
    “She would unarm her noble heart of that steely resistance against the sweet blows of love.” Sir P. Sidney.
Phrases & compounds
Steely iron — a compound of iron containing less than one half of one per cent of carbon.