the 10th letter of the Arabic alphabet.

Origin of

From Arabic



noun Egyptian Religion.

a sun god of Heliopolis, a universal creator worshiped throughout Egypt (typically represented as a hawk-headed man bearing on his head the solar disk and the uraeus).
Also Re.


Symbol, Chemistry.


regular army.


rear admiral.
Astronomy. right ascension.
royal academician.
Royal Academy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ra

Contemporary Examples of ra

Historical Examples of ra

  • He also is, like Ra and Osiris, a god of the under-world to which men go after death.

    History of Religion

    Allan Menzies

  • Thus it was that other deities assumed a solar character as forms of Ra.

  • O Ra, Ra, to think that it was you all the while who were committing all these thefts!

    St. Winifred's

    Frederic W. Farrar

  • Remember the leap to death and the Boat of Ra, and those by whom it was captained.

    Morning Star

    H. Rider Haggard

  • The primacy of Ra is illustrated by the fact that Amon was identified with him.

British Dictionary definitions for ra



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


abbreviation for

rear admiral
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
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

Medicine definitions for ra


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.

Science definitions for ra


The symbol for radium.




A rare, bright-white, highly radioactive element of the alkaline-earth group. It occurs naturally in very small amounts in ores and minerals containing uranium, and it is naturally luminescent. Radium is used as a source of radon gas for the treatment of disease and as a neutron source for scientific research. Its most stable isotope is Ra 226 with a half-life of 1,622 years. Atomic number 88; melting point 700°C; boiling point 1,737°C; valence 2. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.