The word "collobium" is a rare term that refers to a type of vestment worn by Catholic priests during mass. The spelling of this word can be explained using the International Phonetic Alphabet (IPA) as /kəˈləʊbiəm/. The first syllable is pronounced with a schwa sound, followed by a long "o" sound in the second syllable. The third syllable is pronounced with a short "i" sound and the final syllable is pronounced with a schwa sound followed by an "m" sound. Despite its infrequent use, it's important to spell this word correctly in order to accurately convey the intended meaning.