One of the mysteries of the English language finally explained.
A stem of a plant, especially a grass, bearing flower stalks at short intervals.
- ‘This gene did not affect plant height, indicating that the length of rachis and culm are controlled by independent genetic systems.’
- ‘Hordeum spontaneum and H. vulgare are morphologically similar, with the cultivated form having broader leaves, shorter stem and awns, tough ear rachis, a shorter and thicker spike, and larger grains.’
- ‘Inflorescences are the terminal toothbrush type, with five to 70 pairs of flowers on a rachis approx. 35-50 mm long.’
- ‘Not only does it confer the free-threshing character, but also it influences glume keeledness, rachis toughness, spike length, spike type, and culm height.’
- 1.1 The midrib of a compound leaf or frond.
- ‘Leaf width was determined as the sum of the lengths of the two largest leaflets on either side of the rachis.’
- ‘Because the Sesbania species have pinnately compound leaves, for defoliation the central rachis of the leaf was cut once halfway along its length.’
- ‘The basal leaves can be more than 10 cm long and have three to eleven leaflets along their rachis.’
- ‘In fact, leaflets were more elongated and more tightly packed along the leaf rachis in older plants, signifying that the mass was distributed closer to the axis of bending in older plants.’
- ‘Each leaf has a central rachis to which the many small leaflets are attached.’
The vertebral column or the cord from which it develops.backbone, spinal column, vertebral column, vertebraeView synonyms
The shaft of a feather, especially the part bearing the barbs.
- ‘A contour feather, as a typical feather, has a complex morphology consisting of a central shaft or rachis to which barbs are attached on two margins to form a vane.’
- ‘Natal downs frequently lack a rachis, but numerous barbs come together at a common point.’
- ‘Feathers, however bizarre or morphologically complex, consist essentially of a rachis, barbs, and barbules.’
- ‘Feathers (i.e., with well-defined rachis and barbs) are, therefore, most reasonably interpreted as having evolved primarily in association with flight, rather than for thermoregulatory purposes.’
- ‘Beipiaosaurus and Sinomithosaurus bear short fibers similar to those on Sinosauropteryx, but the structures on Caudipteryx and Protarchaeopteryx are unambiguous feathers, with a central rachis and barbs.’
Late 18th century: modern Latin, from Greek rhakhis ‘spine’. The English plural -ides is by false analogy.
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