The word "Ambustial" is not commonly used in modern English. Its origin can be traced back to the Latin term "ambustus", meaning burnt. The phonetic transcription of "Ambustial" is /æmˈbʌstiəl/ with emphasis on the second syllable. The pronunciation can be divided into three parts, "am" and "sti" are pronounced as in "amber" and "sting" respectively, whereas the "-ual" is pronounced as "yoo-uhl". The spelling of this word may seem complicated, but understanding its roots can aid in its correct pronunciation.
The word ambustial is derived from Latin ambustus, which means scorched or burned. It comes from the verb amburere, meaning to burn around or to scorch. The suffix -ial is added to the root to imply pertaining to or related to. Therefore, ambustial essentially means pertaining to burning or related to scorching.