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rachis
[ rey-kis ]
noun
- 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; rəˈkɪdɪəl; ˈreɪkɪəl /
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
- See spinal columnanother name for spinal column
rachis
/ rā′kĭs /
, Plural rachises răk′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.
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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·chidi·al adjective
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Word History and Origins
Origin of rachis1
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Word History and Origins
Origin of rachis1
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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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