ALVEOLUS, in Anatomy, the sockets in the jaws wherein the teeth are fixed. Some writers speak of teeth growing without alveoli. Pliny mentions a person who had a tooth in his palate. Eustachius relates that he saw a man at 60 who had a tooth growing out of the middle of his fauces. Haller gives an instance of a person whose teeth were of a piece with his jaws, without any insertion into alveoli.