ep ‧ i ‧ de ‧ mi ‧ ol ‧ o ‧ gy /ˌepədiːmiˈɒlədʒi, ˌepɪdiːmiˈɒlədʒi $ -ˈɑːl-/ BrE AmE noun [uncountable]
the study of the way diseases spread, and how to control them
—epidemiologist noun [countable]
—epidemiological /ˌepɪdiːmiəˈlɒdʒɪk ə l $ -ˈlɑː-/ adjective