epidemic
ep-i-dem-ic
adjective
Describing a disease or problem that is widespread in a community.
"The disease reached epidemic proportions quickly."
noun
A rapid, widespread occurrence of an infectious disease in a community.
"The flu epidemic spread quickly through the city."
Thesaurus
Synonyms: plaguey, pestilent, pandemic, epiphytotic, pestiferous, epizootic, pestilential