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 background
Also called: dark-field microscope
ultramicroscope in American English
(ˌʌltrəˈmaɪkrəˌskoʊp)
noun
an instrument equipped to pick up the reflections of light rays dispersed by ultramicroscopic objects lighted from the side and against a dark background,thus making them visible: used esp. in the study of colloidal particles