The spelling of the term "haptogen membrane" can be explained using the International Phonetic Alphabet (IPA) transcription. The word starts with the consonant sound /h/ followed by the vowel sound /æ/ pronounced as "hat". Next, the consonant sound /p/ is pronounced followed by the vowel sound /t/ pronounced as "top". The next syllable consists of the consonant sound /g/ followed by the diphthong /əʊ/ pronounced as "oat". The final syllable is pronounced with the consonant sound /m/ and vowel sound /eɪ/ for "may".
A membrane supposed to surround the fat globules in milk and in other albuminous fluids.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.