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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.
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.
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).
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.
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.
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.
Jun 8, 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.
Rachis Definition. The main stem of an elongated inflorescence, as in a grass. The principal axis of an inflorescence or of a compound leaf. Spinal column. The shaft of a feather, esp. that part bearing the barbs. (zoology, anatomy) The spine or the vertebrae of the spine.
1. a thornlike process or projection; called also acantha and spina. 2. the rigid bony structure in the midline of the back, composed of the vertebrae; called also backbone, spinal column, and vertebral column. The spinal column is the axis of the skeleton; the skull and limbs are in a sense appendages.
What does the noun rachis mean? There are seven meanings listed in OED's entry for the noun rachis, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence. rachis has developed meanings and uses in subjects including.
Jun 4, 2024 · rachis (plural rachises or rachides) In some squid species, the pen rachis flares out into wings on either side, and the tip of the rachis grows into a thick cone.
