Myopachynsis is not a commonly used word, however, its spelling can be explained by using the International Phonetic Alphabet (IPA). The first two syllables, "my-o", are pronounced as /maɪoʊ/, with the letter "y" representing the diphthong /aɪ/. The next syllable, "pa", is pronounced as /pæ/, while the fourth syllable, "chy", is pronounced as /kaɪ/. The final two syllables, "n-sis", are pronounced as /n-sɪs/, with the letter "y" representing /ɪ/. Therefore, the word myopachynsis is pronounced as /maɪoʊ-pæ-kaɪn-sɪs/.
Muscular hypertrophy.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.