|a serious viral disease of Central West Africa, characterized by high fever and muscular pains|
|[named after Lassa, the village in Nigeria where it was first identified]|
Lassa fever Las·sa fever n.
A highly fatal form of epidemic hemorrhagic fever caused by Lassa virus and characterized by high fever, sore throat, severe muscle aches, skin rash with hemorrhages, headache, abdominal pain, vomiting, and diarrhea. Also called Lassa hemorrhagic fever.