Relating to gastroenterology or the medical specialty dealing with the digestive system.
From 'gastroenterology' + '-ical' suffix, an alternative to '-ic' that creates the same meaning. Both '-ic' and '-ical' forms are acceptable in English, though '-ical' sounds slightly more formal.
The fact that English lets us say both 'gastroenterologic' and 'gastroenterological' shows how flexible our language is—both work, but the longer one sounds more impressive in academic papers!
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