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mi·cro·sphere

n :  a spherical shell that is usu. made of a biodegradable or resorbable plastic polymer, that has a very small diameter usu. in the micrometer or nanometer range, and that is often filled with a substance (as a drug or antibody) for release as the shell is degraded .
 
 

 
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North Big Horn Hospital District (Lovell, Wyoming - Big Horn County)