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 for data dictionary
From The Free On-line Dictionary of Computing (30 December 2018) :

  data dictionary
      A data structure that stores metadata, i.e. data
     about data.  The term "data dictionary" has several uses.
     Most generally it is a set of data descriptions that
     can be shared by several applications.
     Usually it means a table in a database that stores the
     names, field types, length, and other characteristics of
     the fields in the database tables.
     An active data dictionary is automatically updated as changes
     occur in the database.  A passive data dictionary must be
     manually updated.
     In a DBMS, this functionality is performed by the system
     catalog.  The data dictionary is a more general software
     utility used by designers, users, and administrators for
     information resource management.
     The data dictionary may maintain information on system
     hardware, software, documentation, users, and other aspects.
     Data dictionaries are also used to document the database
     design process itself and can accumulate metadata
     ready to feed into the system catalog.
     [Does anybody call them "codebooks"?]

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