Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Positronium" Definition
noun
A short-lived association of an electron and a positron bound together in a configuration resembling the hydrogen atom.
Source: American Heritage Dictionary
A short-lived system that consists of a and an electron bound together and is suggestive of a hydrogen atom.
Source: Merriam-Webster
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