Masthelcosis (mæstˈhɛlkəʊsɪs) is a medical condition that affects the lungs. The word is derived from two Greek words: masto (meaning breast) and helcosis (meaning ulceration). The spelling of the word can be explained using the International Phonetic Alphabet (IPA). The "m" sound is followed by the "æ" sound, which represents the "a" in "cat". The stress is on the second syllable, indicated by the mark above the "e". The "kh" sound is like the "ch" in "loch", and the "əʊ" represents the "o" in "go". Finally, the "s" and "ɪs" sounds at the end represent the word's plural form.
Ulceration of the breast.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.