The bristle feathers that typically occur on the face and may serve protective and sensory purposes meld the flight feathers’ stiff shafts (called rachises) with the down feathers’ fluffy base. Definition of 'rachis' rachis in british english or rhachis (ˈreɪkɪs ) noun word forms The series of vertebrae that extend from the cranium to the coccyx, providing support and forming a flexible bony case for the spinal cord Columna vertebralis [ta] , backbone, rachis, spina, spinal column, spine (2) Medical dictionary for the health professions and nursing © farlex 2012 The central stem of a leaf or flower spike that has several parts
The spine (= line of… 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. From new latin rachis, from ancient greek ῥάχις (rhákhis, “spine, ridge”). The axis of an inflorescence when somewhat elongated, as in a raceme. See examples of rachis used in a sentence.
An exception is a capitula, where the main axis is the receptacle. The rachis is the central shaft or axis of a leaf or flower structure, particularly in compound leaves It connects the leaflets or other parts, playing a crucial role in the leaf's overall structure and function.
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