Definition

1. A mechanical or electronic device that keeps doors, drawers, chests, or similar objects securely closed and can be opened with a key or a code.
2. A semicircular metal loop, with one side rounded and the other side fitted with an iron rod.
3. A white marking that extends from a horse’s forehead to its lower jaw.

Example Sentences:

• We cannot enter because the lock mechanism of the door is broken.
• The key to the success of this project is proper time management.
• The gear teeth are stabilized thanks to the lock system.
• The interaction between an antibody and an enzyme is compared to the lock-and-key model.