Pronunciation: (hī'lum), [key]
—pl. -laPronunciation: (-lu). [key]
a. the mark or scar on a seed produced by separation from its funicle or placenta.
b. the nucleus of a granule of starch.
2. Mycol.a mark or scar on a spore at the point of attachment to the spore-bearing structure.
3. Anat.the region at which the vessels, nerves, etc., enter or emerge from a part.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.