Alipterium is a rare word that refers to an imaginary substance that enables flight. The spelling of the word can be broken down using the International Phonetic Alphabet (IPA) as follows: /ælɪpˈtɪərɪəm/. The first syllable starts with the short "a" sound, followed by "l" and "ɪ" sounds. The second syllable starts with the stressed "p" sound, followed by the "t" and "ɪ" sounds. The third syllable starts with the "ə" sound, followed by the "r" and "ɪ" sounds. The final syllable starts with the "ə" sound, followed by the "m" sound.