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antiworld

[an-tee-wurld, an-tahy-] /ˈæn tiˌwɜrld, ˈæn taɪ-/
noun
1.
Often, anti-worlds. Physics. a hypothetical world composed of antimatter.
Origin
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anti-world

antiworld

/ˈæntɪˌwɜːld/
noun
1.
a hypothetical or supposed world or universe composed of antimatter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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