The spelling of the word "pulsellum" can seem confusing at first glance, but it follows phonetic rules. In IPA transcription, it is pronounced /ˈpʌlsələm/, with stress on the first syllable. The first syllable is pronounced like "pull," while the following syllables are pronounced as "suh-lum." The double L in the word is a common feature of Latin-derived words, indicating a long or doubled sound. In anatomy, a pulsellum is a small pulsating structure, often referring to a blood vessel or nerve.
A posterior flagellum constituting the organ of locomotion in certain protozoan organisms.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.