mo·nan·drous \-rəs\adjective 1.[mon- + -androus] a.of a plant: having flowers with a single stamen < many orchids are monandrous > b.of a flower: having a single stamen 2.[Greek monandros, from mon- + -andros having (such or so many) men — more at -androus]: of, relating to, or characterized by monandry < a monandrous family system >