The spelling of "neuroarthritism" may seem complicated, but it can be broken down using IPA phonetic transcription. The first syllable "neuro" is pronounced /njʊərəʊ/, with the stress on the first syllable. The second syllable "arthrit" is pronounced /ɑːθrɪt/. The final syllable "ism" is pronounced /ɪz(ə)m/. Therefore, the correct spelling would be "neuroarthritism", with the stress on the first syllable and a clear distinction between the three syllables when pronouncing the word.
A condition in which there is a predisposition to nervous and rheumatoid or gouty disorders.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.