The series of bones situated at the back from the head to the pelvis of a person, or from the head to the tail of an animal; backbone, vertebral column.
Something resembling a backbone, such as a ridge, or a long, central structure from which other structures radiate.
A pointed, fairly rigid protuberance or needle-like structure on an animal, shell, or plant.
The heartwood of trees.
Courage or assertiveness.
The stiffness of an arrow.
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