Of, relating to, or belonging to the appendix, especially the small tube attached to the large intestine.
From Latin appendix + -eal (adjective-forming suffix). This medical adjective is the standard modern form, preferred over older forms like 'appendical' because -eal clearly signals the Latin nominative base.
Medical English standardized on -eal over -ical because it felt more 'properly Latin'—but ironically, -ical is the older adjective suffix! Medicine creates hierarchies of 'correctness' that aren't based on actual linguistic history.
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