Source : Webster's Revised Unabridged Dictionary (1913)

Pentateuch \Pen"ta*teuch\, n. [L. pentateuchus, Gr. ?; ? (see
   {Penta-}) + ? a tool, implement, a book, akin to ? to
   prepare, make ready, and perh. to E. text. See {Five}, and
   {Text}.]
   The first five books of the Old Testament, collectively; --
   called also the {Law of Moses}, {Book of the Law of Moses},
   etc.

Source : WordNet®

Law of Moses
     n : the laws (beginning with the Ten Commandments) that God gave
         to the Israelites through Moses; it includes many rules
         of religious observance given in the first five books of
         the Old Testament (in Judaism these books are called the
         Torah) [syn: {Mosaic law}]