the 10th letter of the Arabic alphabet.
Origin of rā
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
astronomy right ascension
(in Britain) Royal Academician or Academy
(in Britain) Royal Artillery
Argentina (international car registration)
Word Origin for RA
(sense 5) from República Argentina
the chemical symbol for
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
"hawk-headed sovereign sun god of Egyptian mythology," from Egyptian R' "sun, day."
Online Etymology Dictionary, © 2010 Douglas Harper
The symbol for the elementradium
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
The symbol for radium.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.