Dizzy Gillespie diz·zy·gil·lespie uncommon noun 1. United States jazz trumpeter and exponent of bebop (1917-1993) SynonymsGillespieDizzy GillespieJohn Birks Gillespie Related words Broader terms trumpeter WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.