The word "milk scall" is an Irish term for "a person who is too old to work but able to beg". Its spelling can be a bit tricky, but it is pronounced as "/mɪlk skɔːl/". The "milk" is pronounced with a short "i" sound, followed by a hard "k" sound, while the "scall" is pronounced with a long "o" sound and a silent "l". With the help of the International Phonetic Alphabet (IPA), we can easily understand the correct pronunciation of this peculiar word.
Crusta lactea.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.