jigsaw puzzle

noun
1.
Also called picture puzzle. a set of irregularly cut pieces of pasteboard, wood, or the like that form a picture or design when fitted together.
2.
any complex, confusing situation, condition, or item, as one composed of seemingly diverse or unrelated elements.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
jigsaw puzzle
 
n
a puzzle in which the player has to reassemble a picture that has been mounted on a wooden or cardboard base and cut into a large number of irregularly shaped interlocking pieces

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

jigsaw puzzle

any set of varied, irregularly shaped pieces that, when properly assembled, form a picture or map. The puzzle is so named because the picture, originally attached to wood and later to paperboard, was cut into its pieces with a jigsaw, which cuts intricate lines and curves. Jigsaw puzzles may be very complicated vis-a-vis the number of pieces and the number of different cuts and thus take many hours to complete

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
And once you've got the normal gene, you can try to figure out how it fits into
  the jigsaw puzzle of eye development.
If this addition is accepted, then all the pieces of the cosmological jigsaw
  puzzle will fit together.
Gamers can also collect gold coins and jigsaw puzzle pieces throughout the
  indoor and outdoor environments.
The final weeks of the fantasy season start to resemble a frustrating jigsaw
  puzzle.
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