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WordNet-Online 
 Definitions from WordNet
Noun periclase has 1 sense 
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| Definitions from the WebPericlaseDefinition:Periclase is a mineral composed of magnesium oxide (MgO), commonly found in metamorphic rocks. It is typically colorless or light gray and often occurs as small octahedral crystals or massive aggregates. Senses:
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| pericardial cavity pericardial sac pericardial space pericardial vein pericarditis pericardium pericarp pericementoclasia periclase pericles pericope pericyte peridinian peridiniidae peridinium peridition peridium 
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