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.