Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Ancient Greek τρίφθογγος
Ancient Greek τρῐ́ς (affix)
Ancient Greek φθόγγος (affix)

English triphthong (mention)
French triphtongue (cognate)
Italian trittongo (derived)
Dutch drieklank (semantic loan)
Dutch triftong (derived)