The correct spelling of the word is "gastonomy," which is pronounced /ɡæsˈtɒnəmi/. The word is derived from the Greek word "gastēr," meaning stomach, and the suffix "-nomia," meaning the study of. Hence, "gastonomy" refers to the scientific study of the digestive system and its functions. The incorrect spelling "gastromy" is a common misspelling that often occurs due to the similarity in sound and structure to other words like "gastroscopy" and "gastrectomy."