DIADELPHOUS Meaning of DIADELPHOUS in English [ ˌdʌɪə'dɛlfəs ]■ adjective Botany (of stamens) united by their filaments so as to form two groups.OriginC19: from di- 1 + Gk adelphos 'brother' + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004