Of or characteristic of sisters.

In the manner of a sister, behaving as one would expect of a sister; as a sister, as sisters.

plural of sister company

(India) The jungle babbler, Turdoides striata, habitually flocking in extended family groups.

(business) A group of seven oil companies that dominated the global petroleum industry from the mid-1940s to the 1970s.

Alternative form of sister-in-law

plural of sister-wife

present participle of sister

(obsolete) contiguous

simple past tense and past participle of sister