Source : Webster's Revised Unabridged Dictionary (1913)

Hilus \Hi"lus\, n. [NL.] (Anat.)
   Same as {Hilum}, 2.

Source : WordNet®

hilus
     n : (anatomy) a depression or fissure where vessels or nerves or
         ducts enter a bodily organ; "the hilus of the kidney"
         [syn: {hilum}]
     [also: {hili} (pl)]