ultramicroscopic

listen to the pronunciation of ultramicroscopic
Английский Язык - Турецкий язык
(Tıp) Mikroskopla görülemeyecek derecede ufak olan
Английский Язык - Английский Язык
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