Definition of plagues:
(n) :
(often used with the, sometimes capitalized: the Plague) The bubonic plague, the pestilent disease caused by the virulent bacterium Yersinia pestis.
(n) :
(pathology) An epidemic or pandemic caused by any pestilence, but specifically by the above disease.
(n) :
A widespread affliction, calamity, or destructive influx, especially when seen as divine retribution.
(n) :
(figurative) A grave nuisance, whatever greatly irritates.
(v) :
(transitive) To harass, pester or annoy someone persistently or incessantly.
(v) :
(transitive) To afflict with a disease or other calamity.