radius

Definition

The long bone in the forearm, on the side of the thumb.

Etymology

Borrowed from Latin radius (“ray”). Doublet of ray.

Example Sentences

• "It is also obvious, and proved by experiment, that the rotatory motions observed in the hand proceed from the rotatory motions of the radius."
• "Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment."
• "We start with spherical geometries. The two geometries on spheres of radiuses R₁ and R₂ are obviously identical if R₁ = R₂; moreover, the converse also holds."

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