ultramicroscopic

noun

1. an instrument that uses scattering phenomena to detect the position of objects too small to be seen by an ordinary microscope.

adjective

1. too small to be seen with an optical microscope
2. of or relating to an ultramicroscope

noun

1. a microscope used for studying colloids, in which the sample is strongly illuminated from the side and colloidal particles are seen as bright points on a dark backgroundAlso called: dark-field microscope

adj.

1. Too minute to be seen with an ordinary microscope.
2. Of or relating to an ultramicroscope.

n.

1. A microscope with high-intensity illumination used to study very minute objects.