Source : Webster's Revised Unabridged Dictionary (1913)

Hilum \Hi"lum\, n. [L., a little thing, trifle.]
   1. (Bot.) The eye of a bean or other seed; the mark or scar
      at the point of attachment of an ovule or seed to its base
      or support; -- called also {hile}.

   2. (Anat.) The part of a gland, or similar organ, where the
      blood vessels and nerves enter; the hilus; as, the hilum
      of the kidney.

Source : WordNet®

hilum
     n 1: (anatomy) a depression or fissure where vessels or nerves or
          ducts enter a bodily organ; "the hilus of the kidney"
          [syn: {hilus}]
     2: the scar on certain seeds marking its point of attachment to
        the funicle
     [also: {hila} (pl)]