The branch of science concerned with the phenomena of matter and energy and their interactions. See physic.
- radiation p. the scientific discipline of the application of p. to the use of ionizing radiation in therapy and in diagnostic radiology; including, by extension, nuclear medicine applications, ultrasound, and magnetic resonance imaging.
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phys·ics 'fiz-iks n pl but sing or pl in constr a science that deals with matter and energy and their interactions in the fields of mechanics, acoustics, optics, heat, electricity, magnetism, radiation, atomic structure, and nuclear phenomena
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phys·ics (fizґik) [Gr. physis nature] the science of the laws and phenomena of nature, but especially of the forces and general properties of matter and energy.Medical dictionary. 2011.