A minute calculus, usually multiple, sometimes constituting a coarse sand called gravel. [micro- + G. lithos, stone]
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mi·cro·lith 'mī-krō-.lith n a microscopic calculus or concretion <rupture of \microliths into blood vessels (Modern Medicine)> compare GRAVEL (1)
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mi·cro·lith (miґkro-lith) [micro- + -lith] a minute concretion or calculus.Medical dictionary. 2011.