spine

Definitions

• 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.
• (figurative) Courage or assertiveness.
• The stiffness of an arrow.