Deuterocanonical Books
Greek deuteros, "second," + kanōn, "rule"
Definition
Seven Old Testament books — Tobit, Judith, 1 and 2 Maccabees, Wisdom, Sirach and Baruch — plus parts of Esther and Daniel, accepted by Catholics as inspired Scripture.
"Deuterocanonical" means "of the second canon," referring to the fact that their place in the canon was discussed later than other books — not that they are less inspired. They were included in the Greek Septuagint used by the early Church and by the councils of Hippo (393) and Carthage (397), and solemnly confirmed by the Council of Trent (1546).
Protestant Bibles typically omit them or place them in a separate section called the Apocrypha.