monadelphousPronunciation: /ˌmɒnəˈdɛlfəs/Definition of monadelphous adjective Botany (of stamens) united by their filaments so as to form one group. Origin: early 19th century: from Greek monos 'one' + adelphos 'brother' + -ousmonadelphous in other Oxford dictionaries Definition of monadelphous in the US English dictionary