spine

spine is a   Noun

Definition:

[1] A sharp appendage to any of a plant; a thorn.

[2] A rigid and sharp projection upon any part of an animal.

[3] One of the rigid and undivided fin rays of a fish.

[4] The backbone, or spinal column, of an animal; -- so called from the projecting processes upon the vertebræ.

[5] Anything resembling the spine or backbone; a ridge.

Synonyms: