IPA: /ˈhaɪləm/
KK: /ˈhaɪləm/
The part of a plant or organ where blood vessels, nerves, or ducts enter or exit, or a scar on a seed showing where it was attached.
The hilum of the bean is where it was connected to the plant.
Hilum comes from Latin 'hilum' (meaning a small thing or a trifle). In botanical terms, it refers to a small scar on a seed where it was attached to the ovary wall.
Think of a 'small thing' in Latin, which helps you remember that 'hilum' refers to a small scar on a seed.