流行はやり病やまいはやりやまいMeanings1nounepidemic; plagueRefers to a widespread infectious disease in a community. Often used in historical or literary contexts, but also in modern discussions of outbreaks. Compare with 流行病 (りゅうこうびょう), which is the more technical term.See also: 流行病 (りゅうこうびょう)中ちゅう