The Collaborative International Dictionary of English v.0.48:
Hilus \Hi"lus\, n. [NL.] (Anat.) Same as Hilum, 2. [1913 Webster]WordNet (r) 3.0 (2006):
hilus n 1: (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ; "the hilus of the kidney" [syn: hilus, hilum]