Rachis - Wikipedia
网页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.
Rachis Definition & Meaning - Merriam-Webster
网页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 & Meaning | Dictionary.com
网页Rachis definition: the axis of an inflorescence when somewhat elongated, as in a raceme.. See examples of RACHIS used in a sentence.
Rachis - an overview | ScienceDirect Topics
网页The rachis tapers off toward the top and is grooved longitudinally. It possesses three types of hairs: (i) the fine types spread in the rachel furrows; (ii) the long hairs on the rachel ridges; and (iii) the scarbid hairs on the ridges. The rachis elongates and forms branches and branchlets with a rapid increase in dimensions.
Rachis Definition & Meaning - YourDictionary
网页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.
Rachis | leaf structure | Britannica
网页rachis. leaf structure. Learn about this topic in these articles: angiosperms. In angiosperm: Leaves. …of the petiole called the rachis. Some pinnately compound leaves branch again, developing a second set of pinnately compound leaflets (bipinnately compound).
4.1: Growth Patterns and Inflorescences - Biology LibreTexts
网页2022年7月27日 · The central axis of the inflorescence, starting at the point where the first inflorescence branch is attached, is called the rachis. The rachis may subdivide one or more times, and these subdivisions are considered part of the rachis.
Rachis - Definition, Meaning & Synonyms | Vocabulary.com
网页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 …
RACHIS | English meaning - Cambridge Dictionary
网页RACHIS definition: 1. the central stem of a leaf or flower spike that has several parts: 2. the spine (= line of…. Learn more.
RACHIS definition and meaning | Collins English Dictionary
网页noun Word forms: plural ˈrachises or rachides (ˈrækəˌdiz ; ˈreɪkəˌdiz ) 1. spinal column. 2. Botany. the principal axis of an inflorescence or of a compound leaf. 3. Zoology. the shaft of a feather, esp. that part bearing the barbs.