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tesseract

[tes-uh-rakt] /ˈtɛs əˌrækt/
noun
1.
the generalization of a cube to four dimensions.
Origin
1885-1890
1885-90; < Greek tésser(es) four + aktís ray
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for tesseract
n.

1888, from tessera + Greek aktis "ray" (see actino-).

Online Etymology Dictionary, © 2010 Douglas Harper
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tesseract in Science
tesseract
  (těs'ə-rākt')   

A four-dimensional hypercube, having sixteen corners. See more at hypercube.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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