Hyperaemia \Hy`per*[ae]"mi*a\, n. [NL., fr. Gr. "ype`r over + a"i^ma blood.] (Med.) A superabundance or congestion of blood in an organ or part of the body. {Active hyper[ae]mia}, congestion due to increased flow of blood to a part. {Passive hyper[ae]mia}, interchange due to obstruction in the return of blood from a part. -- {Hy`per*[ae]"mic}, a.