The spelling of the word "Pertuse" may seem confusing at first glance. However, by breaking down the phonetic transcription using IPA symbols, we can understand how this word is spelled: /pɜːtjuːz/ . The "p" sound represents the initial consonant followed by the "ɜː" sound, which is similar to the "er" sound in "her" or "sir". The "tj" sound represents the "ch" sound in "cheese" or "church". Finally, the "uːz" sound represents the plural form of the noun. Together, these sounds make up the correct spelling for "Pertuse."
Punched; perforated or pierced irregularly; in bot., having slits or holes.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.