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Webster 1913 Edition


Rachis


Ra′chis

(rā′kĭs)
,
Noun.
;
pl. E.
Rachises
(rā′kĭs-ĕz)
, L.
Rachides
(răk′ĭ-dēz)
.
[NL., fr. Gr.
ῥάχις
,
-ιος
.]
[Written also
rhachis
.]
1.
(Anat.)
The spine; the vertebral column.
2.
(Bot. & Zool.)
Same as
Rhachis
.

Definition 2024


rachis

rachis

English

Alternative forms

Noun

rachis (plural rachises or rachides)

  1. (botany) The main shaft of either a compound leaf, head of grain, or fern frond.
  2. (zoology, anatomy) The spine or the vertebrae of the spine.
  3. (ornithology) The central shaft of a feather.

Usage notes

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

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