娣dì 1.〈古时arch.〉妇人称丈夫的弟妇为娣,丈夫的嫂子为姒(sì){wife of husband's younger brother, while 姒 sì refers to wife of husband's elder brother}: ～姒(妯娌)。{wives of husband's younger and elder brothers} 2.〈古时arch.〉姐姐称妹妹为娣。{form of address for a woman to call her younger sister}