# rad

(redirected from*Radiation Absorbed Dose*)

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## rad^{ 1}

(răd)*n.*

A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joule 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}

(răd)*adj.*

*Slang*

Excellent; wonderful.

[Short for radical.]

## rad^{ 3}

*abbr.*

radian

## rad

(ræd)*n*

(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

[C20: shortened from radiation]

## rad

*symbol for*

(Units) radian

## rad^{1}

(ræd) *n.*

*Physics.*

a unit of absorbed dose equal to 0.01 Gy. Compare dose (def. 4).

[1915–20; shortening of radiation]

## rad^{2}

(ræd) *n.*

**1.**

*Informal.*a radical.

*adj.*

**2.**

*Slang.*fine; wonderful.

[1820–30; shortening of radical]

## rad

*Math.*

radian.

## rad.

*Math.*

**1.**radical.

**2.**radix.

## rad

(răd) 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.

## rad

**1.**A unit of radiation absorbed from a radioactive source.

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

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