English Dictionary

A sharp appendage to any of a plant; a thorn.
Source : opted (146607)  - auto

A rigid and sharp projection upon any part of an animal.
Source : opted (146608)  - auto

One of the rigid and undivided fin rays of a fish.
Source : opted (146609)  - auto

The backbone, or spinal column, of an animal; -- so called from the projecting processes upon the vertebrae.
Source : opted (146610)  - auto

Anything resembling the spine or backbone; a ridge.
Source : opted (146611)  - auto