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ra·di·an (rad),

A supplementary SI unit of plane angle.
[L. radius, ray]
Farlex Partner Medical Dictionary © Farlex 2012


(rad) (rā'dē-ăn)
A supplementary SI unit of plane angle.
[L. radius, ray]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


1. A unit of angular measurement equivalent to 57.295 degrees. It is subtended at the center of a circle by an arc the length of the radius of the circle.
2. In ophthalmometry, a lens of 1 radian would have one plane surface equal in length to the radius of curvature of the curved surface.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
"Our acquisition of LFS Glove will help Radians to continue our aggressive expansion of our hand protection category.
"Radians Innova group will remain based in Gothenburg and will serve as the central hub for Thorlabs' continued expansion within the Nordic countries, as well as the R&D centre for the expansion of the tunable ECL product line," Thorlabs said.
Radians Innova said that it did not expect sales to pick up until 2004 when the company also expected to reach cash flow break-even.
The Swedish laser and fibre optical specialist Radians Innova AB has reported a turnover of SEK2.4m in the first six months of 2002, which is at the same level as in 2001.