Etymology
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hilum (n.)

1753 in botany, Latin, "little thing, shred, trifle," of unknown origin, said originally to have meant "the eye of a bean." Related: Hilar.

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Definitions of hilum

hilum (n.)
(anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ;
Synonyms: hilus
hilum (n.)
the scar on certain seeds marking its point of attachment to the funicle;
From wordnet.princeton.edu