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ul·tra·mi·cro·tome -'mī-krə-.tōm n a microtome for cutting extremely thin sections for electron microscopy
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n.
an instrument for cutting extremely thin sections of tissue (not more than 0.1 µm thick) for electron microscopy. See also microtome.
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ul·tra·mi·cro·tome (ul″trə-miґkro-tōm) an instrument for making very thin tissue sections for electron microscopy.Medical dictionary. 2011.