Usually means: Central shaft of a feather.
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We found 16 dictionaries that define the word rhachis:

General (11 matching dictionaries)
  1. rhachis: Collins English Dictionary
  2. rhachis: Wordnik
  3. rhachis: Wiktionary
  4. rhachis: Webster's New World College Dictionary, 4th Ed.
  5. rhachis: Infoplease Dictionary
  6. rhachis: Dictionary.com
  7. Rhachis: Online Plain Text English Dictionary
  8. rhachis: Webster's Revised Unabridged, 1913 Edition
  9. Rhachis: AllWords.com Multi-Lingual Dictionary
  10. rhachis: FreeDictionary.org
  11. rhachis: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Rhachis: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Rhachis: Medical dictionary

Science (2 matching dictionaries)
  1. Bird On! (No longer online)
  2. Botanical Terms (No longer online)

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Definitions from Wiktionary (Rhachis)

▸ noun:  Alternative spelling of rachis [(obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine.]

Similar:
spondyl, schelium, chiasm, axiscylinder, neuroaxis, spirochaetosis, columnella, skeletonisation, triskele, crosssection, more...

Opposite:
anterior, front, ventral

Types:
monocot, dicot, angiosperm, gymnosperm, conifer, fern, more...

Adjectives:
main, slender, central, flat, narrow, secondary, elongated, zigzag, long, common

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Similar:
spondyl, schelium, chiasm, axiscylinder, neuroaxis, spirochaetosis, columnella, skeletonisation, triskele, crosssection, more...

Opposite:
anterior, front, ventral

Types:
monocot, dicot, angiosperm, gymnosperm, conifer, fern, more...

Adjectives:
main, slender, central, flat, narrow, secondary, elongated, zigzag, long, common



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