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Adjective: diphthongal  dif'thóng-gul or dip'thóng-gul
  1. Relating or belonging to a diphthong; having the nature of a diphthong
    "The tendency to make the long vowels diphthongal is noticed by foreigners as a peculiarity of the English language"

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dip solder
DIP switch
dipeptide
diphenhydramine
diphenyl
diphenylbutyl piperidine
diphenylhydantoin
diphtheria
diphtheritic
diphthong
diphthongal
diphthongise
diphthongize
Diphylla
Diphylla ecaudata
Dipladenia
Dipladenia boliviensis
Diplazium pycnocarpon
diplegia
diplo-
diplococcus