Sust. FEM. Tiny, microscopic, dimensions called nanoparticles particle physics: less than 100 nanometers: i.e. one hundred portions of matter of a millionth of a meter. Applies in electronic research, optics, biomedical, etc. The word is of Greek origin, composed of the substantive «nános»: dwarf, «phýsis»: nature and the suffix 'ika', which means ' relative to '.