an·te·pe·nult /ˌæntɪˈpiˌnʌlt, pɪˈ/
  倒數第三音節(a.)倒數第三的
  An·te·pe·nult An·te·pe·nult·i·ma n.  Pros. The last syllable of a word except two, as -syl- in monosyllable.
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  antepenult
       n : the 3rd syllable of a word counting back from the end [syn:
           antepenultimate]