am·phi·ar·thro·sis 
(ăm′fē-är-thrōsĭs)
(ăm′fē-är-thrōsĭs)n. pl. am·phi·ar·thro·ses (-sēz)
A type of articulation between bony surfaces that permits limited motion and is connected by ligaments or elastic cartilage, such as that between the vertebrae.