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n. Biology A main axis or shaft, such as the main stem of an inflorescence, the stalk of a pinnately compound leaf, or the spinal column.

n. The main shaft of either a compound leaf, head of grain, or fern frond.

n. The spine or the vertebrae of the spine.

n. The central shaft of a feather.

n. The spine; the vertebral column.

n. Same as Rhachis.

n. In botany:

n. The axis of an inflorescence when somewhat elongated; the continuation of the peduncle along which the flowers are ranged, as in a spike or a raceme.

n. In a pinnately compound leaf or frond, the prolongation of the petiole along which the leaflets or pinnæ are disposed, corresponding to the midrib of a pinnately veined simple leaf. See cut under compound.

n. In zoöl. and anatomy:

n. The vertebral column.

n. The stem, shaft, or scape of a feather, as distinguished from the web, vane, or vexillum; especially, that part of the stem which bears the vexillum. as distinguished from the calamus or quill. See quill, 4.

n. The median part of the radula of a mollusk, usually bearing teeth which differ from those on each side of it.

n. The axial skeleton of various polyp-colonies, as of Gorgonia; some axial part, or formation like a midrib, as in crinoids.

n. axis of a compound leaf or compound inflorescence

n. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

"Pinnately compound leaves have the leaflets arranged along the main or mid-vein (called a rachis in this case). odd pinnate: with a terminal leaflet, e.g. Fraxinus (ash). even pinnate: lacking a terminal leaflet, e.g. Swietenia (mahogany)."

axis   

generative rachis   

rhachises    rhachis   

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