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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·cist (-fĭz′ĭ-sĭst) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Atomic Physics) (functioning as singular) the branch of physics concerned with small objects and systems, such as atoms, molecules, nuclei, and elementary particles
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
mi•cro•phys•ics(ˌmaɪ krəˈfɪz ɪks)
(used with a sing. v.) the branch of physics dealing with elementary particles, atoms, and molecules.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.