rachis

rachis
rachidian /reuh kid"ee euhn/, rachial /ray"kee euhl/, rachidial, adj.
/ray"kis/, n., pl. rachises, rachides /rak"i deez', ray"ki-/.
1. Bot.
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. Ornith. the part of the shaft of a feather bearing the web. See illus. under feather.
3. Anat. See spinal column.
Also, rhachis.
[1775-85; < NL < Gk rháchis spine, ridge, backbone]

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Universalium. 2010.

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