noun
Euphemistic, often used in informal or intimate contexts; the honorific prefix お softens the directness.
彼女は恥ずかしそうにおまたを隠した。
She shyly covered her vulva.
Honorific prefix お + 股 (また, 'crotch'). The exact origin as a euphemism for female genitals is uncertain, but it likely arose from indirect reference to the crotch area.