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[rah] /rɑ/
noun
1.
the 10th letter of the Arabic alphabet.
Origin of
From Arabic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for

RA

abbreviation
1.
rear admiral
2.
(astronomy) right ascension
3.
(in Britain) Royal Academician or Academy
4.
(in Britain) Royal Artillery
5.
Argentina (international car registration)
Word Origin
(sense 5) from República Argentina

Ra1

Chemical symbol
1.
radium

Ra2

/rɑː/
noun
1.
the ancient Egyptian sun god, depicted as a man with a hawk's head surmounted by a solar disc and serpent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for

Ra

"hawk-headed sovereign sun god of Egyptian mythology," from Egyptian R' "sun, day."

Online Etymology Dictionary, © 2010 Douglas Harper
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in Medicine

Ra
The symbol for the element radium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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in Science
Ra  
The symbol for radium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for

RA

noun

Anger; the RED ASS (1942+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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