The spelling of the word "AMITINUS" can be explained using the International Phonetic Alphabet (IPA). The first sound is "æ," a short "a" sound. This is followed by "m" and "ɪ," representing the "i" sound as in "it." The next two sounds are "t" and "ɪn," producing a short "i" sound and an "n" respectively. The final three sounds are "ʌ," for a short "u" sound, "s," and an unstressed "əs" for the plural suffix. Therefore, the correct spelling of this word using IPA is /ˌæmɪˈtɪnəs/.