Dictionaryper•i•do•titePronunciation: (per'i-dō"tīt, pu-rid'u-tīt"), [key] —n. a coarsely granular igneous rock composed chiefly of olivine with an admixture of various other minerals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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