View synonyms for

rachis

Or ��·��󾱲�

[rey-kis]

Phonetic (Standard)IPA

noun

rachises, rachides

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.
Ornithology.��the part of the shaft of a feather bearing the web.
Anatomy.��spinal column.

rachis

/ ˈreɪkɪs, ˈreɪkɪəl, rəˈkɪdɪəl /

rachis

rachises

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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Origin of rachis¹

1775–85; < New Latin < Greek ��á��󾱲� spine, ridge, backbone

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Origin of rachis¹

C17: via New Latin from Greek rhakhis ridge

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Examples have not been reviewed.

“The thickness of the rachis in some specimens is 3 microns thick. That’s less than the size of the average cell,” O’Connor says.

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It had a magenta rachis down the center with soft green vanes that shimmered yellow and purple and blue depending on how you turned it.

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But this specimen lacked the rachis; it just had barbs and barbules down its ribbonlike tail.

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Their structure suggests that the two finest tiers of branching in modern feathers, known as barbs and barbules, arose before the rachis formed.

From

Fruit.—Fleshy, coalescent and sunk in the rachis.

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