1. Radii. The semi-diameter of a circle, being a straight line drawn from the centre to the circumference; the exterior bone of the forearm; the ray of a flower. The radius vector, a line drawn from the centre of force to the point of the orbit where the body is supposed to be.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• rabits,
• rades,
• readius,
• radishs,
• radify,
• raidus,
• readins,
• radus,
• rdius,
• rasis,
• ratius,
• radiar,
• raduis,
• rodins,
• radiats,
• radious,
• raius,
• redies,
• dadius,
• rapdis

• radix,
• rattus,
• radich,
• radice,
• radish,
• rates.

The adjective form of the word "radius" is "radial".

The plural of the "radius" can be the "radii".

The singular of the "radius" can be the "radius".