nonaxial
Nonaxial is an anatomical and biomechanical term used to describe joints or movements that do not involve rotation around a fixed axis. In nonaxial joints, the articulating surfaces are nearly flat, allowing gliding movements confined to a plane and little or no rotation about a principal axis. This type of motion is primarily translational rather than angular.
In anatomy, nonaxial motion is typically associated with plane (gliding) joints. Examples include the intercarpal joints
Nonaxial movement is often contrasted with other joint classifications based on the number of axes allowed.
Etymology-wise, nonaxial comes from the Latin non- meaning not and axis, indicating the absence of rotation