伯母

bómǔ
  1. wife of father's elder brother
  2. aunt
  3. (polite form of address for a woman who is about the age of one's mother)

classifier: 個

CEDICT

Entry Composition

1 伯 bó
  1. father's elder brother
  2. senior
  3. paternal elder uncle
  4. eldest of brothers
  5. respectful form of address
  6. Count, third of five orders of nobility 五等爵位 wǔděngjuéwèi
2 母 mǔ
  1. mother
  2. elderly female relative
  3. origin
  4. source
  5. (of animals) female