GNU Collaborative International Dictionary of English

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1.       
   Diatomous , a. [Gr. διάτομος cut through, fr. διατέμνειν to cut through; διά through + τέμνειν to cut. Cf. Diatom.] (Min.) Having a single, distinct, diagonal cleavage; -- said of crystals.
   Mohs.
   
   1913 Webster