In dictionaries:
Under Lock and Key
Securely locked and carefully guarded.
lock and key model
Enzyme and substrate specific interaction.
caps lock key
Toggles uppercase letters on keyboard.
Lock and key
A lock is a mechanical or electronic fastening device that is released by a physical object (such as a key, keycard, fingerprint, RFID card, security token or coin), by supplying secret information (such as a number or letter permutation or password), by a combination thereof, or it may only be able to be opened from one side, such as a door chain.
more...