sis

A daughter of the same parents as another person; a female sibling.

“My sister is always driving me crazy.”

A female member of a religious order; especially one devoted to more active service; (informally) a nun.

“Michelle left behind her bank job and became a sister at the local convent.”

Any butterfly in the genus Adelpha, so named for the resemblance of the dark-colored wings to the black habit traditionally worn by nuns.

A senior or supervisory nurse, often in a hospital.

Any woman or girl with whom a bond is felt through common membership of a race, profession, religion or organization, such as feminism.

“Connie was very close to her friend Judy and considered her to be her sister.”

(sometimes capitalized) A black woman.

A form of address to a woman.

“What’s up, sister?”

A woman, in certain labour or socialist circles; also as a form of address.

“Thank you, sister. I would like to thank the sister who just spoke.”

An entity that has a special or affectionate, non-hierarchical relationship with another.

“sister city”

A node in a data structure that shares its parent with another node.

(usually attributively) Something in the same class.

“sister facility”