The spelling of the word "athetosises" can be quite puzzling for many people. The correct pronunciation is [æθi'toʊsiz], which is reflected in its spelling. The word refers to involuntary movements often seen in patients with cerebral palsy. The plural form is formed by adding the suffix "-es" to the word "athetosis". Despite its challenging spelling, understanding the correct pronunciation and meaning of this word is essential for healthcare professionals working with patients with this condition. It is also crucial for those who want to improve their spelling and language skills.