Other terms
for canonical books should be
distinguished:
the protocanonical books, deuterocanonical books,
and
the apocryphal books.
The protocanonical
(from the Greek proto meaning
first)
books are those books of the Bible that were
admitted
into the canon of the Bible with little or no debate
(e.g., the
Pentateuch of the Old Testament and the Gospels)
The deuterocanonical (from the Greek deutero meaning
second) books are those books of the Bible that were
under discussion for a while until doubts about
their
canonicity were resolved (e.g., Sirach and Baruch of
the
Old Testament, and the Johannine epistles of the New
Testament).