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There are 4 words beginning with POSITRO

POSITRONpositron n. (Physics) The antimatter equivalent of an electron, having the same mass but a positive charge.
POSITRON n. an electron but with a positive charge, also POSITON.
POSITRONSpositrons n. Plural of positron.
POSITRON n. an electron but with a positive charge, also POSITON.
POSITRONIUMpositronium n. (Physics, chemistry) An exotic atom (specifically, an onium) consisting of a positron (anti-electron)…
POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom.
POSITRONIUMSpositroniums n. Plural of positronium.
POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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