polydisperse
adjective
poly·dis·perse ˌpä-lē-di-ˈspərs 
: of, relating to, or characterized by or as particles of varied sizes in the dispersed phase of a disperse system
polydispersity
ˌpä-lē-di-ˈspər-sə-tē
noun 
Word History
Etymology
borrowed from German polydispers, from poly- poly- + dispers "dispersed," borrowed from Latin dispersus, past participle of dispergere "to spread about, scatter, disperse" — more at disperse
Note: The term was introduced by the German chemist Wolfgang Ostwald (1883-1943) in Grundriss der Kolloidchemie, 2. Auflage, 1. Hälfte (Dresden, 1911), p. 39.
First Known Use
1915, in the meaning defined above
Medical Definition
polydisperse
adjective
poly·dis·perse -dis-ˈpərs
: of, relating to, characterized by, or characterized as particles of varied sizes in the dispersed phase of a disperse system compare monodisperse