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A long, narrow raised part of a surface, especially the top of a mountain range or a similar elevated line on land or an object.

Firm strength of character that allows someone to do what is right or necessary, especially when it is difficult or unpopular.

The most important or strongest supporting part of an organization, system, group, or activity, on which other parts depend.

The row of connected bones running down the middle of the back in humans and many animals, forming part of the skeleton and protecting the spinal cord.

The row of small bones running down the middle of the back in humans and other animals, forming the backbone.

Firmness, courage, or strength of character, especially the ability to stand up to pressure or opposition.

The main central part of a long structure, area, or system that supports or organizes the rest.

A long, narrow raised line that forms the upper edge of something such as a ridge, roof, or bone.