solid-state physics(n = noun.cognition) - the branch of physics that studies the properties of materials in the solid state: electrical conduction in crystals of semiconductors and metals; superconductivity; photoconductivity;
is a kind of natural philosophy, physics

atomic physics, department of physics, high energy physics, high-energy physics, nuclear physics, particle physics, physics, physics class, physics department, physics lab, physics laboratory, plasma physics, quantum physics, radiation physics, solar physics, solid-state