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An Object-Relational Database (ORD) is a DataBase Management System (DBMS) that's composed of both a Relational DataBase Management System (RDBMS) and an Object-Oriented Database (OOD) (OODBMS). ORD supports the basic components of any object-oriented database model in its schemas and the query language used, such as objects, classes, and inheritance.

An Object-Relational DataBase may also be known as an Object-Relational DataBase Management System (ORDBMS).

Source: https://www.techopedia.com/definition/8714/object-relational-database-ord