大姨妈 Traditional 大姨媽 dà yí mā 🔊 mother's eldest sister (older than one's… + Review this word Meanings dà yí mā 大姨媽 mother's eldest sister (older than one's mother)(coll.) (euphemism) Aunt Flo (i.e. menstrual period) Its characters 大dàbig; old (in age)HSK 1姨yímother's sisterHSK 6妈māma