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View synonyms for rachis

rachis

or rha·chis

[ rey-kis ]

noun

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


rachis

/ ˈreɪkɪs; ˈreɪkɪəl; rəˈkɪdɪəl /

noun

  1. botany the main axis or stem of an inflorescence or compound leaf
  2. ornithol the shaft of a feather, esp the part that carries the barbs
  3. another name for spinal column
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


rachis

/ kĭs /

, Plural rachises răkĭ-dēz′,rākĭ-

  1. 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.


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Derived Forms

  • rachial, adjective
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Other Words From

  • ra·chid·i·an [r, uh, -, kid, -ee-, uh, n], ra·chi·al [rey, -kee-, uh, l], ra·chidi·al adjective
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Word History and Origins

Origin of rachis1

1775–85; < New Latin < Greek rháchis spine, ridge, backbone
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Word History and Origins

Origin of rachis1

C17: via New Latin from Greek rhakhis ridge
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Example Sentences

The pinnules are from a line to two lines long, and are adnate to the secondary rachis by a more or less decurrent base.

The stipes is somewhat longer than the rachis, and it is of a whity-green colour.

A simple inflorescence of flowers on pedicels of equal length arranged on a common, elongated axis (rachis).

A simple inflorescence of sessile flowers arranged on a common, elongated axis (rachis).

Under these conditions the midvein is called the rachis (a), and the divisions are called the pinn (b).

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rachiotomyrachitis