διφθογγιστέον
διφθογγιστέον, one must write with a diphthong
Alas! Could not find the search term διφθογγιστέον.
Found the closest form διφθέρα. Other nearby forms can be found in the wordwheel, or perhaps try searching again without accents.
Morpho works with a static database. If you like, you can compare the output of Morpheus.
Parsed as:
feminine nominative singular (Luc)
✓ feminine vocative singular (Luc) of
διφθέρα
No checked forms of διφθογγιστέον in the morphology database.