diaphonically

adverb1

1. •
   In a diaphonic manner.

   • For a phonetic transcription of RP, we would generally transcribe GB[hə.ˈləʊ̯.ˈwɜːld] instead, to show that the diphthong diaphonically transcribed as [oʊ̯] has a more unrounded, central starting point, hence GB[əʊ̯]