Definitions for rachisˈreɪ kɪs; ˈræk ɪˌdiz, ˈreɪ kɪ-
Random House Webster's College Dictionary
ra•chisˈreɪ kɪs; ˈræk ɪˌdiz, ˈreɪ kɪ-(n.)(pl.)ra•chis•es, rach•i•des
any of various axial structures of a plant, as the stem of a leaflet.
the part of the shaft of a feather bearing the web.
Ref: spinal column.
Origin of rachis:
1775–85; < NL < Gk rháchis spine
axis of a compound leaf or compound inflorescence
spinal column, vertebral column, spine, backbone, back, rachis(noun)
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
"the fall broke his back"
The main shaft of either a compound leaf, head of grain, or fern frond.
The spine or the vertebrae of the spine.
The central shaft of a feather.
the spine; the vertebral column
same as Rhachis