iron hat

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i´ron hat`

n.1.(Geol., Mineral.) Same as gossan.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
So SANLUIS Rassini developed a two-piece rotor design for the Corvette Z51 Performance Package, which combines a ductile iron hat with grey iron plates.
The body is one-600 iece design made in GS-spheroidal cast iron hat is precision-machined complete, inside and out.