The word "abomasitia", which refers to the fourth stomach of ruminants, may seem like a difficult word to spell. However, it follows quite regular English phonetic patterns. "Abomasitia" is pronounced /əˌboʊməˈsɪʃə/, with the stress on the third syllable. The "a" in the first and third syllables is pronounced as a schwa, while the "o" in the second and fourth syllables is pronounced with a long "o" sound. The "tia" at the end is pronounced as "shuh." With this understanding of its phonetic transcription, spelling "abomasitia" should be no trouble at all.
Inflammation of the abomasum.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.