spines

noun

1. 1

   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.

2. 2

   Something resembling a backbone, such as a ridge, or a long, central structure from which other structures radiate.

3. 3

   A pointed, fairly rigid protuberance or needle-like structure on an animal, shell, or plant.

4. 4

   The heartwood of trees.

5. 5

   Courage or assertiveness.

6. 6

   The stiffness of an arrow.