The spelling of the word "uncoossified" may appear confusing at first glance. However, by using the International Phonetic Alphabet (IPA), we can break down its pronunciation to better understand its spelling. The IPA transcription of "uncoossified" is /ʌn.kuːs.ɪ.faɪd/. The "u" in "un" is pronounced as the vowel sound in "but" and "ooss" is pronounced as the "oo" in "book". The ending "-ified" follows the usual spelling pattern of adding "-ify" to a base word.
Not coossified, not united into one bone.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.