Definition of epidemiology noun from the Oxford Advanced Learner's Dictionary

 

epidemiology

 noun
noun
BrE BrE//ˌepɪˌdiːmiˈɒlədʒi//
 
; NAmE NAmE//ˌepɪˌdiːmiˈɑːlədʒi//
 
[uncountable]
 
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the scientific study of the spread and control of diseases Word Origin late 19th cent.: from Greek epidēmia ‘prevalence of disease’ + -logy.
See the Oxford Advanced American Dictionary entry: epidemiology