acantha
UK /əˈkæn.θə/ US /əˈkæn.θə/
noun 3
Definitions
noun
1
A prickle.
2
A spine or prickly fin.
3
A spinous process of a vertebra.
Moreover, all the outgrowths which I have said constitute the acantha are not of equal size in all the vertebrae, and Nature has done this with wonderful forethought.
Individual vertebral bodies (right) as seen from the side and from above. The acantha is the spiney projection on the right of each illustration: in the lower illustration the boney spinal canal is shown between the acantha and the vertebral body.
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