Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

sister

play
noun sis·ter \ˈsis-tər\

Simple Definition of sister

  • : a girl or woman who has one or both of the same parents as you

  • —used when talking to a woman

  • : a member of a religious community of women

Full Definition of sister

  1. 1 :  a female who has one or both parents in common with another

  2. 2 often capitalized a :  a member of a women's religious order (as of nuns or deaconesses); especially :  one of a Roman Catholic congregation under simple vowsb :  a girl or woman who is a member of a Christian church

  3. 3a :  a girl or woman regarded as a comradeb :  a girl or woman who shares with another a common national or racial origin; especially :  a black girl or woman

  4. 4 :  one that is closely similar to or associated with another <sister cities>

  5. 5 chiefly British :  nurse

  6. 6a :  girl, womanb :  person —usually used in the phrase weak sister

  7. 7 :  a member of a sorority

Examples of sister

  1. The sisters live in the convent.



Origin of sister

Middle English suster, sister, partly from Old English sweostor and partly from Old Norse systir sister; akin to Latin soror sister, Sanskrit svasṛ


First Known Use: before 12th century


Medical Dictionary

sister

play
noun sis·ter \ˈsis-tər\

Medical Definition of sister

  1. chiefly British :  a head nurse in a hospital ward or clinic; broadly :  nurse





Learn More about sister


Seen and Heard

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

WORD OF THE DAY

February 6, 2016

an official order, decree, or edict

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez duvet spindrift kittly-benders
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ