down antiquark
(paleontology) A member of the extinct genus Oreodon or extinct superfamily Merycoidodontoidea of ruminating hogs.
plural of full sibling
present participle of cultipack
(physics) the antiparticle of a down quark
加速器の実験で、研究者たちは高エネルギー衝突から出現したダウン反クォークを検出した。
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