- the mark or scar on a seed produced by separation from its funicle or placenta.
- the nucleus of a granule of starch.
- Mycology. a mark or scar on a spore at the point of attachment to the spore-bearing structure.
- Anatomy. the region at which the vessels, nerves, etc., enter or emerge from a part.
Origin of hilum
1650–60; < New Latin; Latin: little thing, trifle; see nil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for hilum
An excrescence or appendage at or about the hilum of a seed.
Orthotropous ovule of Buckwheat: c, hilum and chalaza; f, orifice.
Campylotropous ovule of a Chickweed: c, hilum and chalaza; f, orifice.
Hilum, the place of junction of the funiculus with the body of the ovule.
Seed of a Violet (anatropous): a, hilum; b, rhaphe; c, chalaza.
- a scar on the surface of a seed marking its point of attachment to the seed stalk (funicle)
- the nucleus of a starch grain
- a deep fissure or depression on the surface of a bodily organ around the point of entrance or exit of vessels, nerves, or ducts
C17: from Latin: trifle; see nihil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for hilum
Latin, literally "little thing, shred, trifle." Related: Hilar.
Online Etymology Dictionary, © 2010 Douglas Harper
- A depression or slit-like opening through which nerves, ducts, or blood vessels enter and leave in an organ or a gland.porta
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- A mark or scar on a seed, such as a bean, showing where it was formerly attached to the plant. The hilum indicates the point of attachment of the funiculus.
- A depression or opening through which nerves, ducts, or blood vessels pass in an organ or a gland, as in the medial aspect of the lungs or the kidneys .
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.