Inflammation of both the small intestine and the stomach, causing nausea, vomiting, and diarrhea.
From 'entero-' (small intestine), 'gastro-' (stomach), and '-itis' (inflammation). This term emerged in the 1800s as doctors began using microscopes and developed the ability to identify where in the digestive tract inflammation was occurring.
Gastroenteritis (the modern term for stomach flu) is just a rearranged version of this word—doctors later swapped the order to put stomach first, since that's usually where the problem starts!
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