spine

The spinal column of a vertebrate.

Any of various pointed projections, processes, or appendages of animals.

A strong, sharp-pointed outgrowth derived from a leaf or leaf part.

Any of various similar sharp structures, such as a thorn.

Something that resembles or suggests a backbone, as.

The hinged back of a book.

The crest of a ridge.

Strength of character; courage or willpower.

One of the quills of a harpsichord or spinet.