Pronunciation: ' sis-t( ə -)r ə n- ˌ lo ̇ , -t ə rn- ˌ lo ̇
Function: noun
Inflected Form: plural sis · ters-in-law \ -t ə r-z ə n- \
Date: 15th century
1 : the sister of one's spouse
2 a : the wife of one's brother b : the wife of one's spouse's brother