EPIDEMIOLOGY
epidemiology
(noun) the branch of medical science dealing with the transmission and control of disease
Source: WordNet® 3.1
Etymology
Noun
epidemiology (usually uncountable, plural epidemiologies)
(sciences) The branch of science dealing with the spread and control of diseases, viruses, concepts etc. throughout populations or systems.
(sciences) The epidemiological body of knowledge about a particular thing.
Source: Wiktionary
Ep`i*de`mi*ol"o*gy, n. Etym: [Epidemy + -logy.] (Med.)
Definition: That branch of science which treats of epidemics.
Source: Webster’s Unabridged Dictionary 1913 Edition