hilum /ˈhaɪ.ləm/ noun3 •The eye of a bean or other seed, or the center of that eye; the mark or scar at the point of attachment of an ovule or seed to its base or support.The hilum is very prominent in some species and nearly flat in others. — 1913 •A depression or fissure through which ducts, nerves, or blood vessels enter and leave a gland or organ.The shadows of the hila on chest X-ray are mainly formed by the pulmonary arteries (PAs) and some of their main branches and the upper pulmonary veins (PVs). — 2010 •The nucleus of a starch grain.In central hilum starch grains the grain is laid down around the hilum in the form of concentric layers. — 1916 formshila
