Main Entry: ul·tra·mi·cro·scope

Pronunciation: \ˌəl-trə-ˈmī-krə-ˌskōp\

Function: noun

: an apparatus for making visible by scattered light particles too small to be perceived by the ordinary microscope—called also dark-field microscope

—ul·tra·mi·cros·co·py \-mī-ˈkräs-kə-pē\ noun, plural ul·tra·mi·cros·co·pies