noun. undefined

noun. The main stem of an elongated inflorescence, as in a grass.

noun. The main axis of a pinnately compound leaf or of a fern frond.

noun. The main shaft of a bird's feather, especially the part to which the barbs are attached.

noun. The spinal column.

noun. In botany:

noun. 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.

noun. 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.

noun. In zoöl. and anatomy:

noun. The vertebral column.

noun. 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.

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

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

noun. The spine; the vertebral column.

noun. Same as Rhachis.

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

noun. The spine or the vertebrae of the spine.

noun. The central shaft of a feather.

noun. axis of a compound leaf or compound inflorescence

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

generative rachis  

axis  

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rhachis  rhachises