"Syssomus" is a term that is commonly used in the field of entomology to refer to a genus of beetle. The spelling of this word can be explained by breaking it down into its individual phonetic components, which are represented in the International Phonetic Alphabet (IPA). Specifically, the first syllable of "syssomus" is pronounced as "si", while the second syllable is pronounced as "so". The final syllable is pronounced as "m s", with the "m" sound and the "s" sound occurring in quick succession.
A twin monster with two heads, but more or less extensive fusion of the bodies.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.