magnetohydrodynamics

noun (used with a singular verb)

1. the branch of physics that deals with the motion of electrically conductive fluids, especially plasmas, in magnetic fields. Abbreviation: MHD

noun (functioning as singular)

1. the study of the behaviour of conducting fluids, such as liquid metals or plasmas, in magnetic fields
2. the generation of electricity by subjecting a plasma to a magnetic field and collecting the deflected free electrons