The word "Glorioser" is spelled with the letter "i" after "o" because it follows the Latin rule of vowel pronunciation. In Latin, "o" is usually pronounced as /ɔ/ (similar to the vowel sound in "thought") when it's followed by a consonant or at the end of the word. However, when "o" is followed by "i" in Latin, it's pronounced as /o/ (similar to the vowel sound in "go"). Therefore, "Glorioser" is pronounced /ɡlɔriozər/ in IPA phonetic transcription.
A boaster.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
There doesn't appear to be a word "Glorioser" in the English language. It is possible that you might be referring to the word "glorious" or a term that is related to it. The etymology of the word "glorious" can be traced to the Latin word "gloriosus", which means "full of glory" or "praiseworthy". It finds its roots in the Latin word "gloria", meaning "glory" or "renown". Over time, this word evolved and was adopted into various languages, including Old French and Middle English, eventually becoming the word "glorious" in modern English.