GNU Collaborative International Dictionary of English

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1.       
   Microcrith (?), n. [Micro- + crith.] (Chem.) The weight of the half hydrogen molecule, or of the hydrogen atom, at one time taken as the standard in comparing the atomic weights of the elements; “microcriths.  This unit is no longer used, and has been replaced by the Dalton, which is of approximately the same value.  See molecular weight and Crith”.  J. P. Cooke.
   
   [1913 Webster +PJC]