This is opposed to a Sadyovadhu, who is normally a sage's wife, and dedicated to domesticity and the welfare of her family.
According to Monier-Williams’s Sanskrit-English Dictionary, "brahmavādín" means ‘discoursing on sacred texts, a defender or expounder of the Veda, one who asserts that all things are to be identified with Brahman’.
Notable Brahmavadini include: Vak Ambhrini, Lopamudra, Vishwawara, Sikta, Ghosha, and Maitreyi.
Maitreyi, the wife of Yajnavalkya, is accredited with about ten hymns in Rig Veda.
[1] Two suktas (hymns) of the tenth Mandala (book) of Rigveda, 39 and 40, each containing 14 verses, have been attributed to Ghosha.