From Middle Dutch suster, from Old Dutch swester, from Proto-Germanic *swestēr, from Proto-Indo-European *swésōr. The sense “nurse” developed around 1900 due to nuns' activity in institutional care, especially from the mid nineteenth century until the mid twentieth century.
- (somewhat formal) sister (female sibling)
- Synonym: zus
- sister (nun)
- Synonym: non
- nurse (woman who provides care for the ill)