ultramicroscopic

listen to the pronunciation of ultramicroscopic
Englisch - Türkisch
(Tıp) Mikroskopla görülemeyecek derecede ufak olan
Englisch - Englisch
Too small to be seen with an ordinary microscope
too small to be seen without an ultramicroscope
{s} so small that it can only be seen with an ultramicroscope; pertaining to a microscope more powerful than an ordinary microscope