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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 the gonad of the invertebrate nematode Caenorhabditis elegans, a rachis is the central cell-free core or axis of the gonadal arm of both adult males and hermaphrodites where the germ cells have achieved pachytene and are attached to the walls of the gonadal tube. The rachis is filled with cytoplasm. [2] In botany.
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.
Rachis definition: the axis of an inflorescence when somewhat elongated, as in a raceme.. See examples of RACHIS used in a sentence.
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.
Definition of 'rachis' Word Frequency. rachis in British English. or rhachis (ˈreɪkɪs ) noun Word forms: plural rachises, rhachises or rachides, rhachides (ˈrækɪˌdiːz , ˈreɪ- ) 1. botany. the main axis or stem of an inflorescence or compound leaf. 2. ornithology. the shaft of a feather, esp the part that carries the barbs.
The inflorescence of sorghum is the panicle. The vegetative primordium (growing tip) differentiates into the reproductive primordium. The shoot apex elongates into the main axis of the inflorescence, which is called the rachis. The rachis tapers off toward the top and is grooved longitudinally.
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.
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.
Noun. Singular: rachis. Plural: rachides, rachises.
the main axis or stem of an inflorescence or compound leaf. the shaft of a feather, esp the part that carries the barbs. another name for spinal column. Etymology: 17th Century: via New Latin from Greek rhakhis ridge. rachial, rhachial /ˈreɪkɪəl/rachidial, rhachidial /rəˈkɪdɪəl/ adj.
