The spelling of the word "seraf" may be confusing to some, but it is actually quite simple once you understand the phonetic transcription. The IPA transcription for "seraf" is /səˈrɑːf/. This means that the word is pronounced with three syllables and the emphasis is on the second syllable. The first two letters, "se," are pronounced with a short "e" sound. The following "ra" is pronounced with a long "a" sound, and the final "f" is pronounced with a hard "f" sound.
An angel of the highest order.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.