大姨妈

Traditional form:

大姨媽

Pinyin (reading):

dàyímā

Definitions:

• mother's eldest sister (older than one's mother)
• (coll.) (euphemism) Aunt Flo (i.e. menstrual period)

Characters:

• 大 - big, great, vast, high, deep
• 姨 - aunt, mother's sister
• 妈 - mother, mama

Traditional characters:

• 大 - big, great, vast, high, deep
• 姨 - aunt, mother's sister
• 媽 - mother, mama