Wiktionary
                    subkey
                    
                        
                
                                                                    n. 1 (context cryptography English) A partial key. 2 (cx computing Microsoft Windows English) A key located beneath another key in the registry.
Wikipedia
                    Subkey
                    
                        
                
                                                                    Subkey can refer to:
- A hard-coded parameter in a key schedule
 - A key in OpenPGP that is bound by a master key
 
Usage examples of "subkey".
These subkeys provide finer details and a greater range to the possible configuration information for a particular operating system.
This key has a software and system subkeys, which keep track of configuration information.