a female woman or girl having the same parents as another person
(often Sister) a member of a women's religious order; specif a Roman Catholic nun
a fellow female member of a Christian Church
a woman who shares a common tie or interest, e.g. adherence to feminist principles
(often Sister) Brit a female nurse in charge of a hospital ward or a small department: compare charge nurse
informal used in direct address: a girl or woman
(used before a noun) related as if by sisterhood; of the same class, type, etc
sister ships
sisterliness noun
sisterly adj
[Old English sweostor]