The spelling of the word "XRARIUM" may seem unusual but it can be explained through phonetic transcription. The first syllable "XRA" is pronounced with the sound /k/schwa/ɹ/ /æ/. The second syllable "RI" is pronounced with the sound /ɹ/ /ɪ/. And the last syllable "UM" is pronounced with the sound /ʌm/. So, the phonetic transcription of "XRARIUM" is /k/schwa/ɹ/æ/ɹ/ɪ/ʌm/. This word is used to describe a type of exhibit which showcases rare or exotic animals.