??? - 3 letter crossword answer

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R&D

- Research and development; used mostly to refer to the division of a corporation responsible for performing research and developing new products, or the activitie performed by that division; -- a commonly used abbreviation.

R-2

noun -
(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
an intensely radioactive metallic element that occurs in minute amounts in uranium ores

Ra-

- A prefix, from the Latin re and ad combined, coming to us through the French and Italian. See Re-, and Ad-.

Rab

Rad

noun - a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
cool or neat
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)

RAF

noun - a Marxist and Maoist terrorist organization in Germany; a network of underground guerillas who committed acts of violence in the service of the class struggle; a successor to the Baader-Meinhof Gang; became one of Europe's most feared terrorist groups; disbanded in 1998
the airforce of Great Britain

Rag

noun - a boisterous practical joke (especially by college students)
a small piece of cloth or paper
a week at British universities during which side-shows and processions of floats are organized to raise money for charities
break into lumps before sorting; "rag ore"
cause annoyance in; disturb, especially by minor irritations;
censure severely or angrily; "The mother scolded the child for entering a stranger's car"; "The deputy ragged the Prime Minister"; "The customer dressed down the waiter for bringing cold soup"
harass with persistent criticism or carping; "The children teased the new teacher"; "Don't ride me so hard over my failure"; "His fellow workers razzed him when he wore a jacket and tie"
music with a syncopated melody (usually for the piano)
newspaper with half-size pages
play in ragtime; "rag that old tune"
treat cruelly; "The children tormented the stuttering teacher"

RAI

Raj

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