fretsaw(n = noun.artifact) jigsaw, scroll saw - fine-toothed power saw with a narrow blade; used to cut curved outlines;
is a kind of power saw, saw, sawing machine

   A narrow-bladed fine-toothed saw for cutting curved outlines. [WordNet 1.5]

fretsaw, n. a saw consisting of a narrow blade stretched on a frame, for cutting thin wood in patterns.