The term 'pertaining to the ankle' can be summarized by the word 'tarsal, ' which is a six-letter word. Tarsal refers to any of the bones in the ankle joint, which are collectively known as the tarsus. The tarsus is composed of seven bones, which are the talus, calcaneus, cuboid, navicular, medial cuneiform, intermediate cuneiform, and lateral cuneiform. These bones form the ankle joint, which is responsible for the movement of the foot.