名詞 rachis:

1. axis of a compound leaf or compound inflorescence
2. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
   同義詞：spinal column, vertebral column, spine, backbone, back

ra.chis

n.（名詞）
【復(fù)數(shù)】 ra.chis.es 或 rach.i.des [r2k.-dôz., r3.k-] 【生物學(xué)】
A main axis or shaft, such as the main stem of an inflorescence, the stalk of a pinnately compound leaf, or the spinal column.
花序軸：主軸或主莖，如花序的總軸、掌狀復(fù)葉的莖或螺旋狀的柱

來源：
New Latin
現(xiàn)代拉丁語
from Greek rhakhis [spine, ridge]
源自 希臘語 rhakhis [脊柱，山脊]

【引伸】
ra.chial
adj.（形容詞）