luminescence resulting from the rubbing together of the surface of certain solids. It can be produced, for example, when solids are crushed.
See: sonoluminescence
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2281 (https://doi.org/10.1351/pac199668122223)