The spelling of the word "urex" can be explained using the International Phonetic Alphabet (IPA) transcription. The letter "u" is pronounced as /ju/, the letter "r" is pronounced as /ɹ/, the letter "e" is pronounced as /ɛ/, and the letter "x" is pronounced as /ks/. Thus, the complete pronunciation of "urex" would be /ju.ɹɛks/. The word "urex" is not a commonly used word, and it does not have a clear meaning or definition.