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View synonyms for
rachis
or ·
[ rey-kis ]
noun
plural rachises, rachides
- Botany.
- the axis of an inflorescence when somewhat elongated, as in a raceme.
- (in a pinnately compound leaf or frond) the prolongation of the petiole along which the leaflets are disposed.
- any of various axial structures.
- Ornithology. the part of the shaft of a feather bearing the web.
- Anatomy. spinal column.
rachis
/ ˈreɪkɪs; ˈreɪkɪəl; rəˈkɪdɪəl /
noun
- botany the main axis or stem of an inflorescence or compound leaf
- ornithol the shaft of a feather, esp the part that carries the barbs
- another name for spinal column
rachis
- 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 Word Forms
- ··· [r, uh, -, kid, -ee-, uh, n], ·· [rey, -kee-, uh, l], ·i· adjective
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Word History and Origins
Origin of rachis1
1775–85; < New Latin < Greek á 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
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.
From
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.
From
But this specimen lacked the rachis; it just had barbs and barbules down its ribbonlike tail.
From
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.
From
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