sister UK /ˈsɪs.tə(ɹ)/US /ˈsɪs.tɚ/noun 15verb 2forms 5phrases 1 noun15 •a female child of the same parents as someone elseMy sister is always driving me crazy. •Any woman or girl with whom a bond is felt through the same biological sex, gender or common membership in a community, race, profession, religion, organization, or ism.Connie was very close to her friend Judy and considered her to be her sister. •A female fellow member of a religious community, church, trades union etc.Thank you, sister. I would like to thank the sister who just spoke. •(slang) A black woman.A fly sister rolled in with a suitcase full of hip-hop novels called The Glamorous Life, and an African brother with long dreads wanted to sell them some incense and some fake Jacob watches. — 2006 •Title of respect for an adult female member of a religious order.At the convent, Sister Grace supervises the kitchen.Please welcome Sister Smith as she moves from her former congregation to her new congregation. •A female member of a religious order; especially one devoted to more active service; (informal) a nun.Michelle left behind her bank job and became a sister at the local convent. •Title of respect for an adult female member of a fraternal/sororal organization, or comrade in a movement, or even a stranger using fictive kin.Sister Huerta was to have been our initial speaker this morning. However, we received word later this morning that Sister Huerta would be unable to attend our convention. — 1983 •[before a noun] An entity that has a special or affectionate, non-hierarchical relationship with another.sister projects •A node in a data structure that shares its parent with another node. •[before a noun] Something in the same class.sister ships •One of two tornados that form in close proximity at the same time or in quick succession. •(informal) A form of address to a woman.What’s up, sister? •(UK) A senior or supervisory nurse, often in a hospital. •A title used to personify or respectfully refer to concepts or animals.Native American leader Chief Seattle urged ecological responsibility, referring to Brother Eagle and Sister Sky in his purported 1854 speech. •Any butterfly in the genus Adelpha, so named for the resemblance of the dark-colored wings to the black habit traditionally worn by nuns. verb2 •To strengthen (a supporting beam) by fastening a second beam alongside it.I’m trying to correct my sagging floor by sistering the joists. •(no longer used) To be sister to; to resemble closely.Deep clerks she dumbs; and with her needle composes Nature's own shape, of bud, bird, branch, or berry, That even her art sisters the natural roses; Her inkle, silk, twin with the rubied cherry — 1607 formssistered · sistering · sisters · Sisters · sistren Phrases with sister weak sisterA person or thing which is the least robust or least dependable member of a group.