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Adjacent Words

radial engine
radial keratotomy
radial nerve
radial pulse
radial symmetry
radial tire
radial type
radial vein
radial velocity
radial-ply
radial-ply tire
Radiale
Radialia
radially
radially symmetrical
Radiance
radiancy
Radiant
radiant energy
Radiant engine
radiant exposure
radiant flux
radiant heat
radiant heating
Radiant point
Radiantly
Radiary
Radiata

radian definitions

WordNet (r) 3.0 (2005)

n
1: the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) [syn: radian, rad]

Merriam Webster's

noun Date: 1879 a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 57.3 degrees

Oxford Reference Dictionary

n. Geom. a unit of angle, equal to an angle at the centre of a circle the arc of which is equal in length to the radius. Etymology: RADIUS + -AN

Webster's 1913 Dictionary

Radian Ra"di*an, n. [From Radius.] (Math.) An arc of a circle which is equal to the radius, or the angle measured by such an arc.




 


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