Microcrith
Pronunciation : Mi`cro*crith"
Part of Speech : n.
Etymology : [Micro- + crith.] (Chem.)
Definition : Defn: The weight of the half hydrogen molecule, or of the hydrogen atom, taken as the standard in comparing the atomic weights of the elements; thus, an atom of oxygen weighs sixteen microcriths. See Crith. J. P. Cooke.
Source : Webster's Unabridged Dictionary, 1913