jigsaw

[jig-saw]
noun
1.
Also, jig saw. an electric machine saw with a narrow blade mounted vertically in a frame, for cutting curves or other difficult lines or patterns.
verb (used with object), jigsawed, jigsawed or jigsawn, jigsawing.
2.
to cut or form with a jigsaw.
adjective
3.
formed by or as if by a jigsaw: jigsaw ornamentation.

Origin:
1870–75; jig2 + saw1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
jigsaw (ˈdʒɪɡˌsɔː)
 
n
1.  a mechanical saw with a fine steel blade for cutting intricate curves in sheets of material
2.  See jigsaw puzzle
 
[C19: from jig (to jerk up and down rapidly) + saw1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

jigsaw
"vertical reciprocating saw," 1873, Amer.Eng., from jig with its notion of "rapid up-and-down motion." Jigsaw puzzle first recorded 1909; originally one with pieces cut by a jigsaw.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If this addition is accepted, then all the pieces of the cosmological jigsaw
  puzzle will fit together.
Before that, his only hint of precocity had been his authoritative war with
  jigsaw puzzles.
Matching proteins is a painstaking process, equivalent to piecing together a
  complex jigsaw puzzle.
As in working a jigsaw puzzle, the first pieces had been the slowest to fit
  into place.
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