Noun
The spine; the vertebral column.
Same as Rhachis.
Source: Webster's dictionarythe fall broke his back Source: Internet
Branched feathers with rachis, barbs, and barbules were discovered in many members including Sinornithosaurus millenii, a dromaeosaurid found in the Yixian formation (124.6 MYA). Source: Internet
Present on the forelimbs and tails, their integumentary structure has been accepted as pennaceous vaned feathers based on the rachis and herringbone pattern of the barbs. Source: Internet
This more primitive morphology (in evolutionary terms) consists of toughened glumes that tightly enclose the grains, and (in domesticated wheats) a semi-brittle rachis that breaks easily on threshing. Source: Internet
Spines may be present on the midrib of leaflets and the rachis of compound leaves. Source: Internet
Owls’ feathers are generally larger than the average birds’ feathers, have fewer radiates, longer pennulum, and achieve smooth edges with different rachis structures. Source: Internet