The word "Perispheric" has a unique spelling that can be explained using IPA phonetic transcription. The first syllable "Peri" is pronounced as /ˈpɛrɪ/ which means around, near or enclosing. The second syllable "spheric" is pronounced as /ˈsfɪrɪk/, which refers to the sphere or round shape. Therefore, the word "Perispheric" means related to the region surrounding the sphere or the area near a cue ball on a pool table. The spelling of this word can be tricky, but its phonetic transcription helps to understand it better.
Having the form of a ball; globular.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.