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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 pi·on /ˈpaɪˌɑn/
 ｋ介子

From: WordNet (r) 2.0

 pion
      n : a meson involved in holding the nucleus together; produced
          as the result of high-energy particle collision [syn: pi-meson]