Steelie

noun
1.
a playing marble made of steel.
noun, Informal.
1.
steelhead.

Read Also:

Steelier
adjective, steelier, steeliest. 1. consisting or made of steel. 2. resembling or suggesting steel, as in color, strength, or hardness.
Steeling
noun 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying according to composition and heat treatment: generally categorized as having a high, medium, or low-carbon content. 2. a […]
Steel-lumber
noun 1. metal lumber composed of sheet steel.