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The Collaborative International Dictionary
Midrib

Midrib \Mid"rib`\, n. (Bot.) A continuation of the petiole, extending from the base to the apex of the lamina of a leaf.

Wiktionary
midrib

n. (context botany English) The strengthened vein down the middle of a flower petal or leaf.

WordNet
midrib

n. the vein in the center of a leaf [syn: midvein]

Usage examples of "midrib".

The bilobed leaf, with the midrib likewise tipped with a bristle, stands in the midst of these projections, and is evidently defended by them.

In the case of Pinguicula, as soon as an insect has been pushed for some little distance towards the midrib, immediate reexpansion would be beneficial, as the margins could not capture fresh prey until they were unfolded.

The hypocotyl of another seedling of the same age was secured to a little stick, and a filament having been fixed to the midrib of one of the cotyledons, the movement of the bead was traced during 14 h.

A filament was fixed to the midrib of one of the longer leaflets, and the movement of the whole leaf was traced, as shown in Fig. 103.

A pinna was cemented with shellac on the summit of a little stick driven firmly into the ground, immediately beneath a pair of leaflets, to the midribs of both of which excessively fine glass filaments were attached.

A more vigorous young plant, bearing only 4 leaves, was then selected, and a filament was affixed to the midrib of the third leaf from the base, which, with the petiole, was 5 inches in length.

A filament was fixed to the midrib of one of the longer leaflets, and the movement of the whole leaf was traced, as shown in Fig.

On another occasion the petiole of a leaf was secured to a little stick close beneath the leaflets, and a filament tipped with a bead of sealingwax was affixed to the midrib of one of them, and a mark was placed close behind.

The leaflets, however, sometimes bend so much back that their midribs become parallel to and lie on the petiole.

They thus become imbricated with their midribs parallel to the petiole.

A young cotyledon or leaf after bursting free is brought down into its proper position, as already remarked, by epinasty, which, according to De Vries, long continues to act on the midribs and petioles.

At the edge of the channel were masses of strange plants with varicolored red-and-green leaves the size of doors, their midribs and veins all studded with golden spines.

It is remarkable that when our plants had grown a little older, viz., to a height of 2 or 3 feet, the petioles did not rise at night, and the midribs of the folded leaves were no longer bent back along one side of the petiole.

Oxalis acetosella: circumnutation and nyctitropic movements of a nearly fullgrown leaf, with filament attached to the midrib of one of the leaflets.

On several occasions, slits about the 1/10 of an inch in length were made with a lancet, close to the bases of the filaments, parallel to the midrib, and, therefore, directly across the course of the vessels.