Basotho An ethnic group native to Lesotho. Noun form of, plural plural of Mosotho Origin From Sotho Basotho. Forms Basoto Basutho Basuto Noun Entry 2 An ethnic group native to Lesotho. Synonyms: Mosotho Mosoto Mosuto Mosutho Forms Basotho Basothos Basoto Basutho Basuto Related Lesotho Mosotho Sesotho Sotho Derived Basotholand Basotoland Basutholand Basutoland