The spelling of the word "arthurs" can be explained through the International Phonetic Alphabet (IPA) transcription. The first syllable "ar" is pronounced as /ɑːr/, whereas the second syllable "thur" is pronounced as /θər/. The final "s" is silent in this word, and it is not pronounced. Overall, the word "arthurs" is pronounced as /ɑːrθər/. It's important to ensure the correct spelling and pronunciation of words to facilitate clear communication and avoid misunderstandings.