noun
    
    plural -ters
    
    [count] :a girl or woman who has one or both of the same parents as you
    
    
    
    
    
    
    
    
    
    informal - used when talking to a woman
    
    
    
    
    
    or Sister [count] :a member of a religious community of women :nun
    
    
    
    
    
    
    
    [count] :a woman who is from the same group or country as you
    
    
    
    
    
    
    
    [count] US informal :a black woman - used especially by African-Americans;
    
    or Sister [count] chiefly Brit :a nurse in a hospital ward or clinic - see also weak sister
    
    adjective
    
    always used before a noun
    
    belonging to the same kind or group :having similar qualities or characteristics