: relating to the properties, structure, or reactivity of solid material; especially : relating to the arrangement or behavior of ions, molecules, nucleons, electrons, and holes in the crystals of a substance (as a semiconductor) or to the effect of crystal imperfections on the properties of a solid substance <solid–state physics>
a : utilizing the electric, magnetic, or optical properties of solid materials <solid–state circuitry>
b : using semiconductor devices rather than electron tubes <a solid–state radio>
First Known Use of SOLID-STATE
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