protectoryyoudaoicibaDictYouDict[protectory 词源字典]
"An institution for the care and education of destitute or delinquent children", Mid 19th cent.; earliest use found in The New York Times. From classical Latin prōtect-, past participial stem of prōtegere protect + -ory, probably after refectory, reformatory, etc.[protectory etymology, protectory origin, 英语词源]