大嫂

dàsǎo
  1. older brother's wife
  2. sister-in-law
  3. elder sister (respectful appellation for an older married woman)

CEDICT

  1. a respectful term of address for an older married woman
  2. sister-in-law (elder brother's wife)

Wiktionary

称谓：(1)用以称大哥的妻子。(2)称呼较年长朋友的太太。(3)丈夫对妻子的称呼。

重編國語辭典

Entry Composition

1 大 dà
  1. big; large; great
  2. older (than another person)
  3. eldest (as in 大姐 dàjiě)
  4. greatly; freely; fully
  5. (dialect) father
  6. (dialect) uncle (father's brother)
2 嫂 sǎo (bound form) older brother's wife; sister-in-law

Related entries

嫂嫂 sǎosao
  1. older brother's wife
  2. sister-in-law
  3. (polite address to a younger married woman) sister
大姨子 dàyízi
  1. sister-in-law
  2. wife's older sister
姨妹 yímèi
  1. wife's younger sister
  2. sister-in-law
姨姐 yíjiě
  1. wife's elder sister
  2. sister-in-law
弟妇 dìfù
  1. younger brother's wife
  2. sister-in-law
大姑 dàgū
  1. father's oldest sister
  2. husband's older sister
  3. sister-in-law
媭 xū (dialect) elder sister (old)
大姐 dàjiě
  1. big sister
  2. elder sister
  3. older sister (also polite term of address for a girl or woman slightly older than the speaker)
姒 sì
  1. wife or senior concubine of husbands older brother (old)
  2. elder sister (old)