rad, n.
(rads)
(rads)
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)
<noun.quantity>
rad radian
a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
<noun.quantity>
rad
semantic pointers
hypernym