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jigsaw (n.)

also jig-saw, vertical reciprocating saw, 1855, American English, from jig with its notion of "rapid up-and-down motion" + saw (n.1). It was largely displaced by the later band-saws. Jigsaw puzzle first recorded 1906; originally one with pieces cut by a jigsaw. Earlier was dissected map (or picture), 1807, "map or picture mounted on board and divided into more or less irregular parts, to be joined together as a puzzle."

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Definitions of jigsaw

jigsaw (n.)
a portable power saw with a reciprocating blade; can be used with a variety of blades depending on the application and kind of cut; generally have a plate that rides on the surface that is being cut;
Synonyms: saber saw / reciprocating saw
jigsaw (n.)
fine-toothed power saw with a narrow blade; used to cut curved outlines;
Synonyms: scroll saw / fretsaw
From wordnet.princeton.edu