The word "circumcissile" is a term used in biology to describe a plant structure that can easily split or divide. Its unique spelling is based on its Latin origins, where the word is pronounced with a hard "c" sound and an emphasis on the second syllable. Using IPA phonetic transcription, the word is spelled /sərˈkʌmsɪsəl/, with the emphasis on the second syllable, marked by the accent on the "u" sound. Overall, the spelling of "circumcissile" accurately reflects its pronunciation and origin.
In bot., to cut round in a circular manner, as seed-vessels opening by a lid.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.