The Collaborative International Dictionary of English v.0.48:

Ripsaw \Rip"saw`\, [See Rip, v. t., 4.] (Carp.)
   A handsaw with coarse teeth which have but a slight set, used
   for cutting wood in the direction of the grain (the fiber);
   -- called also ripping saw.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ripsaw
    n 1: a handsaw for cutting with the grain of the wood [syn:
         ripsaw, splitsaw]