Located or occurring outside a villus or outside the villi (finger-like projections in the small intestine); medical term describing what is beyond the villous structures.
From extra- (outside) + villus (Latin for shaggy hair, used for intestinal projections) + -ar (adjective suffix). The term originates in medical and anatomical terminology.
Your small intestine is lined with millions of villi that increase surface area by up to 600 times—so 'extravillar' describes anything happening in the spaces *between* these incredible little absorbers!
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