Mag-wheel definitions

A wheel made from a magnesium alloy.
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A shiny, lightweight wheel for motor vehicles, having a decorative, symmetrical pattern of holes or spokes around the hub.
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(automotive, originally late 1950s and into 1960s) A wheel for a motor vehicle, made from an alloy of magnesium, typically lighter and offering better heat conduction than steel wheels.
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Origin of mag-wheel

Short for magnesium wheel.