The word "Phrenosin" is spelled with the combination of letters "ph" and "e". The "ph" sound is pronounced as /f/ in the IPA phonetic transcription because it comes from the Greek letter "phi" which represents that sound. The "e" in the middle of the word is pronounced as /ɛ/ because it is a short vowel sound. The rest of the letters follow their common English pronunciation. The word "Phrenosin" does not have a commonly known meaning and may be a fictional or specialized term.
A cerebroside containing galactose.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.