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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||magnetic pyrites - a brownish iron sulfide mineral (FeS) having weak magnetic properties|
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
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