antihelium
American Heritage Dictionary:
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an·ti·he·li·um
(ăn'tē-hē'lē-əm, ăn'tī-) 
n.
The antimatter equivalent of helium.
n.
The antimatter equivalent of helium.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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