jigsaw

Concise Oxford English Dictionary © 2008 Oxford University Press:
jigsaw/ˈʤɪɡsɔː/

▶noun

• 1 a puzzle consisting of a picture printed on cardboard or wood and cut into numerous interlocking shapes that have to be fitted together.

• 2 a machine saw with a fine blade enabling it to cut curved lines in a sheet of wood, metal, etc.