Relating to the elbow and the radius bone, one of the two major bones in the forearm.
From cubito- (elbow) + radial (relating to the radius bone, from Latin radius meaning spoke/ray). Anatomical term for forearm bone relationships.
Your radius is literally named after a bicycle spoke because it's the bone that rotates when you turn your hand palm-up and palm-down—medieval anatomists had a sense of humor!
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