ˈfīlōˌvīrəs noun
Etymology: New Latin, from Latin fil um thread + New Latin -o - + virus — more at file
: any of a family (Filoviridae) of single-stranded chiefly filamentous RNA viruses infecting vertebrates that comprises a single genus ( Filovirus ) characterized by a helical nucleocapsid and glycoprotein envelope and that includes the Marburg virus and the Ebola viruses