dystome

from The Collaborative International Dictionary of English v.0.48
Dystome \Dys"tome\, a. [Gr. dys- ill, hard + tomo`s cutting,
   diate`mnein to cut.] (Min.)
   Cleaving with difficulty.
   [1913 Webster]

   Note: Datolite was called dystome spar by Mohs. Dysuria
    

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