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[rah]
noun
  1. the 10th letter of the Arabic alphabet.
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Origin of

From Arabic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for

RA

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

(sense 5) from República Argentina

Ra

1
the chemical symbol for
  1. radium
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Ra

2

Re

noun
  1. the ancient Egyptian sun god, depicted as a man with a hawk's head surmounted by a solar disc and serpent
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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

Word Origin and History for

Ra

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

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Online Etymology Dictionary, © 2010 Douglas Harper

in Medicine

Ra

  1. The symbol for the elementradium
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

in Science

Ra

  1. The symbol for radium.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.