noun
: an anatomical articulation that consists of a bony pivot in a ring of bone and ligament (as that of the odontoid and atlas) and that permits rotatory movement only
noun
: an anatomical articulation that consists of a bony pivot in a ring of bone and ligament (as that of the odontoid and atlas) and that permits rotatory movement only
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012