Definition

1. Noun (Botany):

   • A small scar or mark on a seed, indicating the point where it was formerly attached to the seed stalk (funicle) or to the ovary wall.

2. Noun (Anatomy):

   • A depression or opening in an organ where blood vessels, nerves, lymphatic vessels, or ducts enter or leave. This area serves as a point of entry and exit for these structures.

Usage Examples

• Noun (Botany):

  • The hilum of a bean seed is often a distinct, oval-shaped mark on its surface.
  • Botanists study the hilum to understand seed development and attachment.

• Noun (Anatomy):

  • The renal vessels and ureter connect to the kidney at its hilum.
  • The surgeon carefully avoided the hepatic hilum during the procedure.

Advanced Usage

• "Hilar" (Adjective): Pertaining to or located near a hilum.
  • The hilar lymph nodes were examined for signs of disease.
• In medical imaging, the term is often used to describe the appearance of this region.
  • The chest X-ray showed prominent hilar markings.

Variants and Related Words

• Hilus: A direct synonym, often used interchangeably with "hilum," especially in anatomy.
  • The hilus of the lung is a common site for lymph node enlargement.

Synonyms

• Scar (specifically for the botanical sense).
• Fissure, depression, portal (for the anatomical sense, describing the opening or area).

Notes on Meaning

• The meaning is highly specialized and context-dependent. It is primarily used in scientific fields (botany, anatomy, medicine). The botanical meaning refers to a mark on a seed, while the anatomical meaning refers to an entry/exit point on an organ.

Noun

1. the scar on certain seeds marking its point of attachment to the funicle
2. (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ
   • the hilus of the kidney