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nodular cast iron

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noun
  1. any of various cast irons strengthened by having the graphite content in the form of nodules rather than flakes, and containing cerium or magnesium as well as other additives.
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Origin of nodular cast iron

First recorded in 1945–50
Also called ductile iron.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018