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 WordNet Dictionary |  
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|   | Definition: |   | [n]  a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a micro-constituent of steel and cast iron   |  
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|   | See Also: |   | cast iron, cementite, ferrite, globular pearlite, granular pearlite, iron carbide, lamellar mixture, steel |       |  
 Webster's 1913 Dictionary |  
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|   | Definition: |   | \Pearl"ite\, Pearlstone \Pearl"stone`\, n. (Min.)
A glassy volcanic rock of a grayish color and pearly luster,
often having a spherulitic concretionary structure due to the
curved cracks produced by contraction in cooling. See Illust.
under {Perlitic}.
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