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Definition of villus noun from the Oxford Advanced American Dictionary

 

villus

 noun
noun
NAmE//ˈvɪləs//
 
(pl. villi
NAmE//ˈvɪlaɪ//
 
, NAmE//ˈvɪli//
 
)
(biology)
 
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any one of the many small thin parts shaped like fingers that stick out from some surfaces on the inside of the body (for example in the intestine ). Villi increase the area of these surfaces so that substances can be absorbed by the body more easily.
See the Oxford Advanced Learner's Dictionary entry: villus