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Here is part of the article:
A Miasmatic theory of Endometriosis
In Webster's dictionary, the term "miasm" is followed by these meanings:
"a vaporous exhalation (as of a marshy region or of a putrescent matter) formerly believed to contain a substance causing disease (as malaria)"
"a pervasive influence or atmosphere that tends to deplete or corrupt". Its Greek root is "miainein" which means "to defile". "to defile" means "to make something dirty or no longer pure" "to damage something holy or sacred".
According to Shahrdar:
"From Hahnemann's writings, it is evident that he also uses the word "miasm" simply to describe an infectious and contagious disease with a specific cause and pattern of growth which can appear in different forms of propagation such as sporadic, endemic or epidemic. In his view, a miasm may be acute or it can be chronic with ever progressing effects on the individual. Speaking in Hahnemann's language, it should be noted that what is now known as a miasm is actually a chronic miasm".
Hence a chronic miasm is a disease that keeps progressing even when a prescription has been made that covers the presenting symptom - for according to Hahnemann, there is a hidden process that needs to be prescribed for and an unmasking of the original symptoms before a miasmatic prescription can take place.