martinet – a person who believes in strict discipline and expects you to obey all orders
(Pronounced mahr-tuh-net)
To remember the definition of the word martinet, use the following mnemonic:
Ma kept the tough kids in a net (martinet). She believes in strict discipline.

Examples of martinet in a sentence
The person in charge was a martinet who treated all those beneath her like idiots.
When I was young, I thought my mother was a martinet because she was constantly ordering me around the house
As a colonel in the army, Lee is a martinet who believes discipline is the only path to success.