[ noun ] the fifth book of the Old Testament; contains a second statement of Mosaic law <noun.communication>
Deuteronomy \Deu`ter*on"o*my\, n. [Gr. ?; ? second + ? law: cf. L. Deuteronomium.] (Bibl.) The fifth book of the Pentateuch, containing the second giving of the law by Moses. ||
The other text has as its core Deuteronomy and is called the "Dtr." text.