Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The central or principal vein of a leaf.
from The Century Dictionary.
- noun In botany, the middle (often the only) rib or nerve of a leaf; a continuation of the petiole, extending from the base to the apex of the lamina. See
nervation . - noun In apiculture, the septum or partition between the two sheets of cells which are found in every comb. Phin, Dict. Apiculture, Int., p. xiii.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Bot.) A continuation of the petiole, extending from the base to the apex of the lamina of a leaf.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun botany The strengthened
vein down the middle of aflower petal orleaf .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the vein in the center of a leaf
Etymologies
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Examples
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The leaves when magnified are seen to be composed of a single layer of cells, except the midrib, which is made up of several thicknesses of elongated cells.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell
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As I was doubtful whether this was due to the cells on the upper surface of the lobes, or to the sensitive filaments, being acted on by exosmose, one leaf was first tried by pouring a little of the same solution in the furrow between the lobes over the midrib, which is the chief seat of movement.
Insectivorous Plants Charles Darwin 1845
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The first and the second glumes are empty, subequal, narrowly linear with a strong midrib which is produced into a long capillary awn.
A Handbook of Some South Indian Grasses K. Rangachari
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Something is made of the midrib which is in great demand at Rome, on the
Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 2 Thomas Jefferson 1784
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Brown midrib corn (BMR) is lower in lignin content (about half of normal corn silage), and 6 to 8 percentage units higher in total plant digestibility.
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Needles are 2-6 cm long, flattened, strongly waxy and silvery-white on the lower surface, green above, mostly 2-ranked, spreading horizontally, not concealing the upper surface of twigs, the needles 1-ranked and spiraled higher on the tree; resin canals marginal, located near the lower epidermis; stomatal rows absent on the upper surface at midleaf, 5-7 stomatal rows on each side of midrib of lower surface.
Grand fir 2009
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Brown midrib corn (BMR) is lower in lignin content (about half of normal corn silage), and 6 to 8 percentage units higher in total plant digestibility.
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“Mikashshah,” the thick part of a midrib of a palm-frond soaked for some days in water and beaten out till the fibres separate.
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The expanding of the flower bud is a pretty process; each lobe, supported by a strong midrib, spreads out into one of the points of a five-pointed star; each point is very sharp and angular because, folding in along these edges in one of the prettiest of Nature's hems is the ruffled margin of the flower.
Archive 2007-07-01 Gumbo Lily 2007
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The expanding of the flower bud is a pretty process; each lobe, supported by a strong midrib, spreads out into one of the points of a five-pointed star; each point is very sharp and angular because, folding in along these edges in one of the prettiest of Nature's hems is the ruffled margin of the flower.
Squash Blossoms Gumbo Lily 2007
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