Botany. A vein of a leaf or analogous part of a plant; spec. the midrib or a vein parallel to it.

Any of the principal veins of a leaf; (formerly) spec. †the central vein, the midrib (obsolete).

Botany. Originally: the midrib of a leaf. In later use more generally: any of the strands of conducting tissue that form the framework of a leaf…

transferred. A rib in a leaf. Obsolete. rare.

transferred and figurative.

The midrib of a leaf. Obsolete. rare.

Any of various plant or animal structures thought to resemble a rib. Cf. rib, n.1 III. Botany. Originally: the midrib of a leaf (now rare). In later…

In the circulatory system of a person or animal: a small or minor vein; (in later use) spec. a very small vein which joins continuously to a…

In extended use. Chiefly Scottish. A hard stalk of a plant; the rigid petiole or midrib of a leaf.

(See quots. 1775 1849.)

Botany. A principal rib or vein, continuous with the petiole, extending through the central part of the blade of a leaf.

A small vein (in various other senses), esp. a branch of a vein in a leaf or in an insect's wing; a veinlet.

Botany. A small branch or subdivision of a vein in a leaf or other plant part; a venule (cf. venule, n. 2). Cf. vein, n. 5b.

Botany. The main axis of a pinnate leaf or frond.

Botany. A vein of a leaf. Now rare.

Botany. A vein or nerve of a leaf or other plant part. Obsolete. rare.