GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Margarite , n. [L. margarita, Gr.  a pearl; cf. F. marguerite.]
   A pearl. [Obs.]
   Peacham.
   
   1913 Webster
   (Min.) A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster.
   1913 Webster