A eosinophil precursor in the granulocytic series, being a cell intermediate in development between a myelocyte and a band form cell. The nucleus becomes indented where the indentation is smaller than half the distance to the farthest nuclear margin; chromatin becomes coarse and clumped; specific granules predominate while primary granules are rare. [ GOC:tfm http://en.wikipedia.org/wiki/Metamyelocyte http://openisbn.com/search.php?q=0721601464&isbn=1/ ]