Webster's English Dictionary

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diphthong

diph.thong \'dif-.tho.n, 'dip-\ \dif-'tho.n-(g)*l, dip-\ n [ME diptonge, 
   fr. MF diptongue, fr. LL dipthongus, fr. Gk ]diphthongos, fr. di- + 
   phthongos voice, sound 1: a gliding monosyllabic speech item that starts at 
   or near the articulato ry position for one vowel and moves to or toward the 
   position for another (as the vowel combination that forms the last part of 
   toy) 2: DIGRAPH  3: a form of the ligature  or oe  - diph.thon.gal aj