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- Dictionaryrachis/ˈreɪkɪs/
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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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).
1. : an axial structure: such as. a (1) : the elongated axis of an inflorescence. (2) : an extension of the petiole of a compound leaf that bears the leaflets. b. : the distal part of the shaft of a feather that bears the web. 2. : spinal column. Examples of rachis in a Sentence.
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 is a noun that can refer to the main axis of a plant, the shaft of a feather, or the spinal column. Learn more about its word forms, synonyms, pronunciation, and usage examples.
1. any of various axial structures of a plant, as the stem of a leaflet. 2. the part of the shaft of a feather bearing the web.
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 is the main stem of an elongated inflorescence, as in a grass, or the principal axis of an inflorescence or of a compound leaf. It can also refer to the spine or the vertebrae of the spine in zoology and anatomy.
