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rachides

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ra⋅chis

  [rey-kis]
Use rachides in a Sentence
–noun, plural ra⋅chis⋅es, rach⋅i⋅des  [rak-i-deez, rey-ki-] .
1. Botany.
a. the axis of an inflorescence when somewhat elongated, as in a raceme.
b. (in a pinnately compound leaf or frond) the prolongation of the petiole along which the leaflets are disposed.
c. any of various axial structures.
2. Ornithology. the part of the shaft of a feather bearing the web.
3. Anatomy. spinal column.
Also, rhachis.

Origin:
1775–85; < NL < Gk rháchis spine, ridge, backbone

Related forms:
ra⋅chid⋅i⋅an  [ruh-kid-ee-uhn] , ra⋅chi⋅al  [rey-kee-uhl] , ra⋅chid⋅i⋅al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ra·chis   (rā'kĭs)   
n.   pl. ra·chis·es or rach·i·des (rāk'ĭ-dēz', rā'kĭ-) Biology
A main axis or shaft, such as the main stem of an inflorescence, the stalk of a pinnately compound leaf, or the spinal column.

[New Latin, from Greek rhakhis, spine, ridge.]
ra'chi·al adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

rachis ra·chis (rā'kĭs)
n. pl. ra·chis·es or rach·i·des (rāk'ĭ-dēz', rā'kĭ-)
See spinal column.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
rachis   (rā'kĭs)  Pronunciation Key 
Plural rachises or rachides (rāk'ĭ-dēz', rā'kĭ-)
A main axis or shaft, such as the main stem of an inflorescence, the stalk of a pinnately compound leaf, the shaft of a feather, or the spinal column.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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