rachis

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Related to rachides: rachilla

ra·chis

(rā′kĭs)

n. pl. ra·chis·es or rach·i·des (răk′ĭ-dēz′, rā′kĭ-)

a. The main stem of an elongated inflorescence, as in a grass.

b. The main axis of a pinnately compound leaf or of a fern frond.

2. The main shaft of a bird's feather, especially the part to which the barbs are attached.

3. The spinal column.

[New Latin, from Greek rhakhis, spine, ridge.]

ra′chi·al adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

rachis

(ˈreɪkɪs) or

rhachis

n, pl rachises, rhachises, rachides or rhachides (ˈrækɪˌdiːz; ˈreɪ-)

1. (Botany) botany the main axis or stem of an inflorescence or compound leaf

2. (Zoology) ornithol the shaft of a feather, esp the part that carries the barbs

3. (Anatomy) another name for spinal column

[C17: via New Latin from Greek rhakhis ridge]

rachial, rhachial rachidial, rhachidial adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ra•chis

(ˈreɪ kɪs)

n., pl. ra•chis•es, rach•i•des (ˈræk ɪˌdiz, ˈreɪ kɪ-)

1. any of various axial structures of a plant, as the stem of a leaflet.

2. the part of the shaft of a feather bearing the web.

3. spinal column.

[1775–85; < New Latin < Greek rháchis spine]

ThesaurusAntonymsRelated WordsSynonymsLegend:

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Noun	1.	rachis - axis of a compound leaf or compound inflorescence axis - the main stem or central part about which plant organs or plant parts such as branches are arranged
	2.	rachis - the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back" spinal column, spine, vertebral column, backbone, back notochord - a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates chine - backbone of an animal canalis vertebralis, spinal canal, vertebral canal - the canal in successive vertebrae through which the spinal cord passes coccyx, tail bone - the end of the vertebral column in humans and tailless apes vertebra - one of the bony segments of the spinal column intervertebral disc, intervertebral disk - a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two) skeletal structure - any structure created by the skeleton of an organism axial skeleton - the part of the skeleton that includes the skull and spinal column and sternum and ribs

Translations

raquis

ra·chis

n. raquis, la columna vertebral.

References in periodicals archive ?

from rachides of dead leaves of Acoelorrhaphe wrightii collected in southeastern Florida.

EMLab P&K Microbiologist Discovers New Species of Linkosia Fungus, Published in Mycotaxon

Oppositely-placed ultimate rachides, 0.5 cm wide and striated, are preserved for a length of 17 cm, and are spaced ca.

Foliar forms of Macroneuropteris scheuchzeri (Pennsylvanian, Sydney Coalfield, Nova Scotia, Canada)

Both characters 43 and 44 are extensions of the morphological diversity displayed by the vascular tissues of frond rachides and are encompassed by character 24 of Pryer et al.