rachis

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English[edit]

English Wikipedia has an article on:
Wikipedia

Alternative forms[edit]

Etymology[edit]

From New Latin rachis, from Ancient Greek ῥάχις (rhákhis, spine, ridge).

Pronunciation[edit]

Noun[edit]

rachis (plural rachises or rachides)

  1. (obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine. [17th-19th c.]
  2. (zoology) An anatomical shaft or axis in a marine invertebrate. [from 18th c.]
    • 2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 115:
      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.
  3. (ornithology) The central shaft of a feather. [from 19th c.]
  4. (botany) The main shaft of either a compound leaf, head of grain, or fern frond. [from 19th c.]

Usage notes[edit]

  • The plural form rachides is based on a mistaken impression of the Ancient Greek stem.

Translations[edit]

References[edit]

  • rachis at OneLook Dictionary Search
  • rachis in The Century Dictionary, The Century Co., New York, 1911

Anagrams[edit]