Plural of gastroscopy; multiple procedures in which a gastroscope is used to examine the inside of the stomach.
From gastroscopy + '-s' (plural marker). This is simply the plural form of the noun gastroscopy.
A single gastroscopy takes only about 15 minutes, and modern ones use high-definition cameras that can show details smaller than the width of a human hair!
Complete word intelligence in one call. Free tier — 50 lookups/day.