rā

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

Ra

[rah] /rɑ/
noun, Egyptian Religion
1.
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.

RA

1.
regular army.

Ra

Symbol, Chemistry
1.
radium.

R.A.

1.
rear admiral.
2.
Astronomy. right ascension.
3.
royal academician.
4.
Royal Academy.
British Dictionary definitions for ra

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

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
Word Origin and History for ra

Ra

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

ra in Medicine

Ra
The symbol for the element radium.

ra in Science
Ra  
The symbol for radium.
radium
  (rā'dē-əm)   
Symbol Ra
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.
Slang definitions & phrases for ra

RA

noun

Anger; the RED ASS (1942+)


Related Abbreviations for ra

Ra

radium

RA

  1. Argentina (international vehicle ID)
  2. rear admiral
  3. reasonable alternative
  4. regular army
  5. remedial action
  6. research assistant
  7. research associate
  8. resident advisor
  9. resident assistant
  10. rheumatoid arthritis
  11. right ascension
  12. right atrium
  13. risk analysis
  14. route analysis

R.A.

Royal Academy