Radius
Part of speech: noun
Definition: The long bone in the forearm, on the side of the thumb. The lighter bone (or fused portion of bone) in the forelimb of an animal. A line segment between any point on the circumference of a circle and its center/centre. The length of this line segment.
R
Part of speech: symbol
Definition: The letter ar, the eighteenth letter of the English alphabet.
Part of speech: verb
Definition: are.