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psammoma

psam·mo·ma

noun \sa-ˈmō-mə\

plural psam·mo·mas or psam·mo·ma·ta \-mət-ə\

: a hard fibrous tumor of the meninges of the brain and spinal cord containing calcareous matter

—psam·mo·ma·tous \sa-ˈmō-mət-əs, -ˈmä-\ adjective

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