also ~al adjective Etymology: International Scientific Vocabulary Date: 1870 too small to be seen with an ordinary microscope, of or relating to an ultramicroscope, ~ally adverb
ULTRAMICROSCOPIC
Meaning of ULTRAMICROSCOPIC in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012