Adjective
extrabiblical (not comparable)
Outside the Bible.
In extra-biblical sources Some of these details can be corroborated, and to some extent amplified, in extrabiblical sources. Source: Internet
There are also many extrabiblical examples of eschatological prophecy, as well as church traditions. Source: Internet
There does not appear to be any firm extrabiblical historical evidence for the existence of any of these characters. Source: Internet