The word "emetology" is an incorrect spelling of "emetology" which is a medical specialty that deals with the study of vomiting and other related disorders. The correct spelling for this word is "emetology" with a single "m". The word comes from the Greek word "ēmētikē" meaning "a remedy for vomiting". "E-meh-tol-uh-jee" is the correct pronunciation of "emetology". The word "emetology" isn't commonly used, and it's important to use the correct spelling to avoid confusion when communicating medical information.
A branch of medicine dealing especially with the nature and cause of vomiting, with remedies for vomiting, and with emetics.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.