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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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: 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: 1. the central stem of a leaf or flower spike that has several parts: 2. the spine (= line of…. Learn more.
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. 3. another name for spinal column.
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).
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.
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. 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.
Definitions of rachis. noun. axis of a compound leaf or compound inflorescence. see more. the main stem or central part about which plant organs or plant parts such as branches are arranged. noun. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord.
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.
Noun. Singular: rachis. Plural: rachides, rachises.
