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Merriam-Webster's Collegiate® Dictionary, 11th Edition

VAN

van de graaff generator
noun
Etymology: Robert J. Van de Graaff died 1967 American physicist
Date: 1937
an apparatus for the production of electrical discharges at high voltage commonly consisting of an insulated hollow conducting sphere that accumulates in its interior the charge continuously conveyed from a source of direct current by an endless belt of flexible nonconducting material