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noun
the 10th letter of the Arabic alphabet.
Origin:
< Arabic
< Arabic
:10
:09
:08
:07
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:05
:04
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:01
Ra
is always a great word to know.
So is quincunx. Does it mean:
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a fool or simpleton; ninny. |
Example Sentences
- RA seems to think that state layoffs are extraordinary events.
- Luego, nuevo la próxima ra ese entonces el polen cubre a pegajosos.
- RA never disappoints: bigger government is always better.
Dictionary.com Unabridged
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.
RA
regular army.
Ra
Symbol, Chemistry.
R.A.
1.
rear admiral.
2.
Astronomy. right ascension.
3.
royal academician.
4.
Royal Academy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
|
Link To Ra
Collins
World English Dictionary
| Ra1 | |
| —the chemical symbol for | |
| radium | |
| 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) |
| [(sense 5) from República Argentina] | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Medical Dictionary
Ra
The symbol for the element radium.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
| Ra
The symbol for radium. |
radium  (rā'dē-əm) Pronunciation Key
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. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Abbreviations & Acronyms
| Ra radium |
RA
|
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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