hilusPronunciation: /ˈhʌɪləs/Definition of hilus noun (plural hili /ˈhʌɪlʌɪ/) Anatomy an indentation in the surface of a kidney, spleen, or other organ, where blood vessels, ducts, nerve fibres, etc. enter or leave it. Origin: mid 19th century: modern Latin, alteration of hilumhilus in other Oxford dictionaries Definition of hilus in the US English dictionary