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. See ‘meaning & use’ for definitions, usage, and quotation evidence. The series of vertebrae that extend from the cranium to the coccyx, providing support and forming a flexible bony case for the spinal cord
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Columna vertebralis [ta] , backbone, rachis, spina, spinal column, spine (2)
Medical dictionary for the health professions and nursing © farlex 2012
Definition of 'rachis' rachis in british english or rhachis (ˈreɪkɪs ) noun word forms The central stem of a leaf or flower spike that has several parts The spine (= line of… Rachis is a term used in biology to refer to the main stem or axis of a plant or animal structure, from which other parts such as branches, leaves, or feathers extend or grow.
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. The axis of an inflorescence when somewhat elongated, as in a raceme. See examples of rachis used in a sentence.
There are seven meanings listed in oed's entry for the noun rachis, one of which is labelled obsolete
