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2 definitions found

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

 psi /ˈsaɪ, ˈpsaɪ/
 希臘文字母的第23字

From: WordNet (r) 2.0

 psi
      n 1: a unit of pressure [syn: pounds per square inch]
      2: the 23rd letter of the Greek alphabet