The word "dionychous" is spelled with a "d," followed by "i-o-n-y-c-h-o-u-s." The IPA phonetic transcription for this word is /daɪˈɑnɪkəs/. The first syllable is pronounced with a long "i" sound, and the second syllable is pronounced with a short "o" sound. The "y" in the third syllable represents the vowel sound "ai," and the final syllable is pronounced with a "k" sound, followed by a "s" sound. Overall, the spelling of "dionychous" reflects the word's origins in ancient Greek.