Sister

adj. related by sisterhood; closely related, associated

n. female sibling; nun, female member of a religious order; head nurse, chief nurse (British); close female friend; fellow woman; female advocate of feminism; fellow black woman (African-American)

One's sibling is one's brother or sister, respectively meaning a male or female with whom one shares at least one parent. This is usually taken to mean that the two people are genetically very close, though it is not always necessarily the case, for example one or more siblings may have been adopted by their parents.
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Noun
1. (Roman Catholic Church) a title given to a nun (and used as a form of address); "the Sisters taught her to love God"
(hypernym) nun
(member-holonym) sisterhood
(classification) Roman Catholic, Western Church, Roman Catholic Church, Church of Rome, Roman Church

Noun
1. a female person who has the same parents as another person; "my sister married a musician"
(synonym) sis
(antonym) brother, blood brother
(hypernym) female sibling
(hyponym) big sister
2. a female person who is a fellow member of a sorority or labor union or other group; "none of her sisters would betray her"
(hypernym) member
(hyponym) Beguine
(member-holonym) sorority
3. sometimes used as a term of address for attractive young women
(synonym) baby
(hypernym) girl, miss, missy, young lady, young woman, fille
(classification) cant, jargon, slang, lingo, argot, patois, vernacular

(v. t.)
To be sister to; to resemble closely.
  

(n.)
One of the same kind, or of the same condition; -- generally used adjectively; as, sister fruits.
  

(n.)
A woman who is closely allied to, or assocciated with, another person, as in the sdame faith, society, order, or community.
  

(n.)
A female who has the same parents with another person, or who has one of them only. In the latter case, she is more definitely called a half sister. The correlative of brother.
  

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