rachis

rachis
[ˈreɪkɪs]
(pl. rachides -kɪdiːz)

(Botany)a stem of a plant, especially a grass, bearing flower stalks at short intervals
(植)花序轴；叶轴；主轴
■the midrib of a compound leaf or frond
（复叶的）中脉
(Anatomy)the vertebral column or the cord from which it develops
(剖)脊柱，脊索
(Ornithology)the shaft of a feather, especially the part bearing the barbs
(鸟)羽轴

rachidial
[rəˈkɪdɪəl]
adjective
语源

late 18th cent.: modern Latin, from Greek rhakhis 'spine'. The English plural -ides is by false analogy

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