lassa virus lassa fever • lassen volcanic national park · · · Info · Definitions · Characters · · lassa virus · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) the RNA virus that causes Lassa fever. Synonyms: Lassa virus. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075 v latin small letter v U+0076