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1728 E. Chambers Cycl. (at cited word) The Radius of the Evolute..is the Part of the Thread comprized between any Point where it is a Tangent to the Evolute, and the correspondent Point, where it terminates on the new Curve.

1738 R. Smith Compl. Syst. Opticks II. 310 If these measures are the same, set it down as the exact radius of concavity of your speculum.

1741 J. Jurin Let. 22 The pupil contracts to a narrower aperture, and the radius of dissipation..is thereby lessened.

1834 J. S. Macaulay Treat. Field Fortification 189 In common mines the horizontal radius of rupture is equal to 1¾ times the line of least resistance... In a vertical direction, this radius is of the same length as the radius of explosion.

1856 T. Dick Compl. Wks. II. 33/1 Convex mirrors..are frequently employed by painters for reducing the proportions of the objects they wish to represent, as the images of objects diminish in proportion to the smallness of the radius of convexity.

1877 Proc. Amer. Philos. Soc. 1876–7 16 498 Saturn's rotating, relative to its orbital velocity, has been accelerated in the ratio of its initial-rupturing radius to Earth's radius of rupture.

1937 Vidette-Messenger (Valparaiso, Indiana) 3 Dec. 6/8 Their radius of explosion was three meters and therefore [it] was believed they were designed to be used to create panic.

1994 Micropaleontology 40 244/1 Posterior border with small radius of convexity.

2003 What Papers Say (Russia) (Nexis) 24 Dec. The missile did not have to perform additional maneuvers near the target, since it had a big radius of explosion.