Dictionary.net

The toothlike process on the upper surface of the axis, which articulates with the atlas above.

A tooth-like peg on the axis round which the atlas rotates, -it is the centrum of the atlas, which has first become free and finally fused with the axis.

tooth-like process of atlas which ascends and articulates with atlas.

See process.

A large, blunt, toothlike p. on the body of the axis, which extends upward to articulate with the atlas.