matron  
noun [ C ] uk/ˈmeɪ.trən/ us/ˈmeɪ.trən/
  (SCHOOL)     
  UK old-fashioned(学校的)女舍监 
a female nurse in a school
   (HOSPITAL)     
  UK护士长(senior nursing officer 的旧称) 
old-fashioned for senior nursing officer UK 
   (PRISON)     
  US(监狱的)女看守 
a woman who is in charge of female prisoners
   (MARRIED WOMAN)     
 US上年纪的已婚妇女;(尤指)孀妇 
a married woman, especially one who is old or a widow (= a woman whose husband has died)