The flexor joints, the most moveable joints in the vertebrate skeleton, are lubricated by fluid that allows bones to slide easily as the joint moves.

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Quizplus · Accepted Answer

Flexor joints refer to the action of flexing rather than a specific type of joint; the most moveable joints in the vertebrate skeleton are synovial joints, which are indeed lubricated by synovial fluid allowing for easy movement.

The Flexor Joints, the Most Moveable Joints in the Vertebrate