We found one dictionary that defines the word nondiphtherial:

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1. nondiphtherial: Wiktionary

Definitions from Wiktionary (nondiphtherial) ▸ adjective:  Not diphtherial. ▸ Words similar to nondiphtherial ▸ Usage examples for nondiphtherial ▸ Idioms related to nondiphtherial ▸ Wikipedia articles (New!) ▸ Popular nouns described by nondiphtherial ▸ Words that often appear near nondiphtherial ▸ Rhymes of nondiphtherial ▸ Invented words related to nondiphtherial