The spelling of the word "Delli" can be explained using the International Phonetic Alphabet (IPA) transcription. The first syllable "Del" is pronounced as /dɛl/, with the "e" having a short vowel sound. The second syllable "li" is pronounced as /li/, with the "i" having a long vowel sound. In summary, "Delli" is spelled as it is pronounced, with a short vowel sound in the first syllable and a long vowel sound in the second syllable.