Prosopantritis is a rare medical condition that affects the facial muscles. The spelling of this word can be daunting, but it can be broken down phonetically as: /prɒsəʊˈpæn.trɪ.tɪs/. The first syllable is pronounced with a short "o" sound, and the "a" in the third syllable is pronounced as a schwa. The word is ultimately derived from Greek, where "prosopon" means "face" and "antrum" means "cavity". Prosopantritis often leads to difficulty speaking, chewing, and smiling, and can be treated with various therapies depending on the severity of the case.
Inflammation of one or both frontal sinuses.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.