microphysics Syllabification: (mi·cro·phys·ics)Pronunciation: /ˌmīkrōˈfiziks/Translate microphysics | into Italian Definition of microphysics noun [treated as singular] the branch of physics that deals with bodies and phenomena on a microscopic or smaller scale, especially with molecules, atoms, and subatomic particles. Derivatives microphysicalPronunciation: /-ˈfizikəl/ adjective microphysics in other Oxford dictionaries Definition of microphysics in the British & World English dictionary