mar ‧ ti ‧ net /ˌmɑːtəˈnet, ˌmɑːtɪˈnet $ ˌmɑːr-/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: Jean Martinet (died 1672), French army officer ]
formal someone who is very strict and makes people obey rules exactly SYN disciplinarian :
The woman in charge was a martinet who treated us like children.