rad

rad ¹  (rd)

n.

A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joules per kilogram of irradiated material. It has been replaced as a standard scientific unit by the gray.

---

[r(adiation) a(bsorbed) d(ose).]

---

rad ²  (rd)

adj. Slang

Excellent; wonderful.

---

[Short for radical.]

---

rad ³

abbr.

radian

---

rad¹

n

(Mathematics & Measurements / Units) a former unit of absorbed ionizing radiation dose equivalent to an energy absorption per unit mass of 0.01 joule per kilogram of irradiated material. 1 rad is equivalent to 0.01 gray

[shortened from radiation]

---

rad²

symbol for

(Mathematics & Measurements / Units) radian

---

rad  (rd)

A unit used to measure energy absorbed by a material from radiation. One rad is equal to 100 ergs per gram of material. Many scientists now measure this energy in grays rather than in rads.

Thesaurus

Noun	1.	rad - a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material radioactivity unit - a measure of radioactivity
	2.	rad - 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) radian angular unit - a unit of measurement for angles milliradian - a unit of angular distance equal to one thousandth of a radian