A joint which cannot move, like that between a tooth and the jaw.
A form of synarthrosis (immovable joint) in which a conical process fits into a socket. An example is the joint between the root of a tooth and the socket in the jawbone.
A conical process fitting into a socket in an immovable joint (e.g., a tooth in its bony socket in the alveolus).
The embryonic sex before differentiation into definitive testis or ovary.