The Collaborative International Dictionary
Epidemy
Epidemy \Ep"i*dem`y\, n. [Gr. ?, fr. ?: cf. F. ['e]pid['e]mie.
See Epidemic.] (Med.)
An epidemic disease.
--Dunglison.
Douglas Harper's Etymology Dictionary
epidemy
"an epidemic disease," especially the plague, late 15c., ipedemye, impedyme, from Old French ypidime (12c., Modern French épidémie), from Late Latin epidemia (see epidemic (adj.)).
Wiktionary
epidemy
n. (context medicine English) An epidemic disease