An alveolus (plural: alveoli) is a word used in anatomy for hollow cavities, which are empty areas within a body.
ʌ n WORD_BOUNDARY æ l v ɪ oʊ l ə s WORD_BOUNDARY p l ʊ ɹ ɹ ə l WORD_BOUNDARY æ l v ɪ ɑ l i WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY w ɜː d WORD_BOUNDARY j uː z d WORD_BOUNDARY ɪ n WORD_BOUNDARY ʌ n æ t ə m i WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY h ɑ l oʊ WORD_BOUNDARY k æ v ɪ t i z WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɛ m p t i WORD_BOUNDARY ɛ ɹ iə z WORD_BOUNDARY w ɪ ð ɪ n WORD_BOUNDARY ʌ WORD_BOUNDARY b ɑ d i WORD_BOUNDARY