1. A female person who has the same parents as another person
   "my sister married a musician";
   - sis [informal]
    
2. A female person who is a fellow member of a sorority or labour union or other group
   "none of her sisters would betray her"
    
3. [Brit] One skilled in caring for young children or the sick (usually under the supervision of a physician)
   "The sister checked the patient's vital signs";
   - nurse
    
4. A woman religious
   "The sister taught at the local Catholic school";
   - nun

1. Closely linked or associated
   "a sister organization"

1. (Roman Catholic Church) a title given to a nun (and used as a form of address)
   "the Sisters taught her to love God"

Derived forms: Sisters, sisters

Type of: adult female, caregiver [N. Amer], carer [Brit], fellow member, female sibling, health care provider, health professional, member, PCP, primary care provider, religious, woman

Part of: nurse-patient relation, sisterhood, sorority [N. Amer]

Encyclopedia: Sister, Sister