Synonym for submicroscopic ... <optics> Particles which, although visible in the ultramicroscope, are too small to be resolved by visible light. This places their size between 0.2 Lm and 0.005 Lm. ... (05 Aug 1998) ... 
Type: Term Pronunciation: ā′mī-krō-skop′ik Synonyms: submicroscopic
amicroscopic Too small to be seen through a microscope; unable to be seen even with a microscope.