A depression or pit on an organ where vessels and nerves enter or leave, such as the hilum of the lung or kidney. The surgeon carefully examined the hilum of the lung to assess the extent of the disease.
The scar on a seed marking the point of attachment to its seed vessel. The botanist pointed out the hilum on the bean seed, explaining its role in seed development.
In mycology, a mark or projection on a fungal spore indicating the point where it was attached to the sterigma or basidium. Under the microscope, the mycologist observed the hilum of each basidiospore.