regimen (n.)youdaoicibaDictYouDict[regimen 词源字典]
c. 1400, medical, "course of diet, exercise, etc. for sake of health;" mid-15c., "act of governing," from Old French regimen (14c.), from Latin regimen "rule, guidance, government, means of guidance, rudder," from regere "to rule" (see regal).[regimen etymology, regimen origin, 英语词源]