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flexagon

[flek-suh-gon, -guh n] /ˈflɛk səˌgɒn, -gən/
noun
1.
a three-dimensional figure having polygonal faces that is constructed from a folded sheet of paper in such a way that different faces are exposed when the figure is flexed along its folds.
Origin
flex1 + -agon (as in hexagon, pentagon, etc.)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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