rachis

UK /ˈɹeɪkɪs/ US /ˈɹeɪkɪs/

noun 4

Definitions

noun

The spinal column, or the vertebrae of the spine.

An anatomical shaft or axis in a marine invertebrate.

In some squid species, the pen rachis flares out into wings on either side, and the tip of the rachis grows into a thick cone.

The central shaft of a feather.

The axis of either a compound leaf, inflorescence, or fern frond.

noun — the series of vertebrae forming the axis of the skeleton and

In some squid species, the pen rachis flares out into wings on either side, and the tip of the rachis grows into a thick cone.

Wiktionary

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In some senses, rachis is marked as obsolete. Watch for register when choosing this word.

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