The term virus or filterable virus is likewise applied to these ultramicroscopic and filterable agents.
In this way as well as by the inoculation of animals the presence of the ultramicroscopic kinds may be demonstrated.
ultramicroscopic ul·tra·mi·cro·scop·ic (ŭl'trə-mī'krə-skŏp'ĭk)
Too minute to be seen with an ordinary microscope.
Of or relating to an ultramicroscope.
ultramicroscope ul·tra·mi·cro·scope (ŭl'trə-mī'krə-skōp')
A microscope with high-intensity illumination used to study very minute objects.