sister-in-law

noun sis·ter-in-law \ ˈsi-st(ə-)rən-ˌlȯ , -tərn-ˌlȯ \
plural sisters-in-law play \ˈsi-stər-zən-ˌlȯ\
1 : the sister of one's spouse
2 a : the wife of one's sibling
b : the wife of one's spouse's sibling

First Known Use of sister-in-law

15th century

in the meaning defined at sense 1

See Words from the same year
NEW! Time Traveler

SISTER-IN-LAW Defined for English Language Learners

sister-in-law

  • : the sister of your husband or wife

  • : the wife of your brother


SISTER-IN-LAW Defined for Kids

sister-in-law

noun sis·ter-in-law \ ˈsi-stər-ən-ˌlȯ \
plural sisters-in-law
1 : the sister of someone's husband or wife
2 : the wife of someone's brother


Seen and Heard

What made you want to look up sister-in-law? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to fill with foolish love or admiration

Get Word of the Day daily email!

Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!