- sister
- sister [sis′tər]n.[ME < ON systir (akin to OE sweoster > dial. suster), akin to Ger schwester < IE * swesor-, sister (> Sans svasar, L soror, OIr siur) < * sewe-, (one's) own, refl. pron. (see SUICIDE) + * sor-, woman: hence, lit., woman of our (family)]1. a woman or girl as she is related to the other children of her parents: sometimes also used of animals2. a woman or girl related to one by having a parent in common; half sister3. a stepsister4. a foster sister5. a close female friend who is like a sister6. a female fellow member of the same race, church, profession, organization, etc. [sorority sister, soul sister]7. [often S-] a member of a female religious community, usually one with simple vows8. something associated with another of the same kind, model, etc.9. Brit. a nurse, esp. a head nurse10. Informal any woman: often used as a familiar term of addressadj.related or seeming to be related as sisters
English World dictionary. V. Neufeldt. 2014.