from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The central or principal vein of a leaf.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The strengthened vein down the middle of a flower petal or leaf.
from the GNU version of the Collaborative International Dictionary of English
- n. A continuation of the petiole, extending from the base to the apex of the lamina of a leaf.
from The Century Dictionary and Cyclopedia
- n. 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.
- n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the vein in the center of a leaf
Sorry, no etymologies found.
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.
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.
The first and the second glumes are empty, subequal, narrowly linear with a strong midrib which is produced into a long capillary awn.
Something is made of the midrib which is in great demand at Rome, on the
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.
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.
“Mikashshah,” the thick part of a midrib of a palm-frond soaked for some days in water and beaten out till the fibres separate.
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.
About six of the innermost of these plumes on each side have the midrib elongated into slender black wires, which bend at right angles, and curve somewhat backwards to a length of about ten inches, forming one of those extraordinary and fantastic ornaments with which this group of birds abounds.
Between these two points there runs a dark curved line exactly representing the midrib of a leaf, and from this radiate on each side a few oblique marks which well imitate the lateral veins.
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