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

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)

Word Origin

(sense 5) from República Argentina

Ra1

the chemical symbol for
  1. radium

Ra2

Re

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

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

in Medicine

Ra

  1. The symbol for the elementradium

in Science

Ra

  1. The symbol for radium.