positronia
(arithmetic) Initialism of greatest common factor.
A large reflectarray.
plural of positronium
Any member of the Colymbidae, an obsolete family made up of two groups of birds that are now known to be unrelated: the grebes (modern Podicipedidae) and the loons/divers (modern Gaviidae).
衝突器内でいくつかの陽電子原子（ポジトロニウム）が生成され、それらはガンマ線に変わって消滅しました。
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