microphysics

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mi·cro·phys·ics

M0275900 (mī′krō-fĭz′ĭks)n. (used with a sing. verb) The physics of molecular, atomic, nuclear, and subnuclear systems.
mi′cro·phys′i·cal (-fĭz′ĭ-kəl) adj.mi′cro·phys′i·cal·ly adv.mi′cro·phys′i·cist (-fĭz′ĭ-sĭst) n.

microphysics

(ˌmaɪkrəʊˈfɪzɪks) n (Atomic Physics) (functioning as singular) the branch of physics concerned with small objects and systems, such as atoms, molecules, nuclei, and elementary particles ˌmicroˈphysical adj

mi•cro•phys•ics

(ˌmaɪ krəˈfɪz ɪks)

n. (used with a sing. v.) the branch of physics dealing with elementary particles, atoms, and molecules. [1880–85] mi`cro•phys′i•cal, adj.