The spelling of the word "is in wind" can be explained phonetically using the International Phonetic Alphabet (IPA). The /ɪz/ sound is represented by the letter "i" followed by the letter "s". The "in" sound is represented by the letter "i" followed by the letter "n". Finally, the "wind" sound is represented by the letters "w," "i," "n," and "d." Together, these sounds form the phrase "is in wind," which can be written phonetically as /ɪz ɪn wɪnd/.