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- DictionaryRa·chis/ˈrākəs/
noun
- 1. a stem of a plant, especially a grass, bearing flower stalks at short intervals.
- 2. the vertebral column or the cord from which it develops.
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Rachis is a noun that refers to an axial structure, such as the axis of an inflorescence, the extension of a compound leaf, or the shaft of a feather. Learn more about its etymology, examples, and related words from Merriam-Webster.
In botany. In plants, a rachis is the main axis of a compound structure. It can be the main stem of a compound leaf, such as in Acacia or ferns, or the main, flower-bearing portion of an inflorescence above a supporting peduncle. Where it subdivides into further branches, these are known as rachillae (singular rachilla).
noun. 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.
May 14, 2024 · a. the axis of an inflorescence when somewhat elongated, as in a raceme. b. (in a pinnately compound leaf or frond) the prolongation of the petiole along which the leaflets are disposed. c. any of various axial structures. 2. Ornithology. the part of the shaft of a feather bearing the web.
4 days ago · 1. Botany. a. the axis of an inflorescence when somewhat elongated, as in a raceme. b. (in a pinnately compound leaf or frond) the prolongation of the petiole along which the leaflets are disposed. c. any of various axial structures. 2. Ornithology. the part of the shaft of a feather bearing the web. 3. Anatomy See spinal column. Also: rhachis.
Definitions of rachis. noun. axis of a compound leaf or compound inflorescence. see more. noun. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord. synonyms: back, backbone, spinal column, spine, vertebral column. see more.
Rachis (plural rachises ): In species with compound-pinnate leaves (such as most Fraxinus species), the “stalk” of the leaf is divided into the petiole and the rachis. While the petiole extends from the leaf node to the first leaflet pair, the part of the “stalk” beyond (distal to) the first leaflet pair is called rachis.
